In a new study, shark researchers working off the eastern coast of New Zealand have found that three species of deep-sea shark are bioluminescent （生物性发光的），producing a soft blue-green light with specialized cells in their skin.
One of the species, the kitefin shark, grows to a length of nearly six feet, making it the largest known bioluminescent animal. The other two species are somewhat smaller than the kitefin, and all are occasionally caught as unintended by-catch by fishers. None are considered in danger of extinction, but little is known about their lifestyles and biology.
Bioluminescence had previously been documented in only around a dozen shark species, so this discovery significantly adds to our knowledge,,, says Jerome Mallefet, lead author of the new study.
In the deep sea, where scientists estimate three-quarters of all creatures are bioluminescent, having the ability to create light can be extremely advantageous. In the depths of the ocean, which receives minimal amounts of sunlight, bioluminescent animals can hide themselves from enemies by producing enough light to match their surroundings. All three species examined in this study have large concentrations of photocytes （发光细 胞）on their undersides, which suggests that these sharks may hide from enemies in just this way.
"The discovery that these three species produce light is not surprising", says David Ebert, director of the Pacific Shark Research Center. That's because researchers think many more species of sharks are likely capable of producing light一Mallefet estimates that perhaps 10 percent of the 540 known species of sharks are bioluminescent. But Ebert thinks even this is far from the truth. "As the deep-sea shark research advances, that number will go even higher," he says.
Both Ebert and Mallefet hope that more attention will be paid to deep-sea sharks in the future, as the creatures and their habitat are understudied and under threat. "A lot of people know that sharks can bite," says Mallefet, "but few people know that they can produce light in the dark. ”
1. What do we know about the bioluminescent shark species?| A．They were quite difficult to catch, |
| B．They preferred to live in the dark. |
| C．They were considered to be endangered. |
| D．They were little known about before the study. |
| A．The function of bioluminescence. | B．The significance of the discovery. |
| C．The terrible surroundings in the sea. | D．The usual activities of sea creatures. |
| A．Agreeable. | B．Scientific. | C．Inaccurate. | D．Inspirational. |
| A．More people will study sharks. |
| B．Deep-sea sharks will grow in number. |
| C．Deep-sea sharks will receive more attention. |
| D．More bioluminescent animals will be found. |
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【推荐1】A recent scientific report says that more than one-fifth of the world’s reptiles (爬行动物) are faced with extinction. The main threat (威胁) to reptiles is the loss of their natural homes, as humans take over more and more natural areas.
The study, written by 52 scientists, is the first worldwide measurement of how threatened different species (物种) of reptiles are. The new report has shown some unhappy news — 21% of all reptile species are in danger of extinction. That’s over 1,800 species in all.
The main reason why these reptiles are dying out is that humans are taking over more and more of their habitats — the places where they naturally live. More land continues to be cleared to make room for cities and towns. Large areas of land are also being cleared so that they can be used as farmland. Logging — cutting down trees for wood — is another big threat to reptile habitat. Turtles and crocodiles are among the most threatened reptiles. Humans are a direct threat here, often killing these animals for their skin or meat.
Similar worldwide studies of birds and mammals (哺乳动物) were made more than ten years ago. The authors of the report say it was harder to collect the money needed to study reptiles. They believe that’s because furry or feathery animals like mammals and birds are more popular with most people. But even if reptiles aren’t considered cute, they play a very important part in nature’s food chains. One service performed by reptiles that humans should appreciate is helping control certain pests, like insects and rats.
We know what must be done to protect reptiles. Bruce Young, one of the leaders of the study, says, “We have all the tools we need.” Protecting natural areas is at the top of the list. Studies show that saving natural areas doesn’t just protect mammals or birds, but all kinds of animals, including reptiles. So the time is always right to do the right thing!
1. What is the top reason for reptiles’ dangerous situation?| A．The lack of food. | B．People’s killing them. |
| C．The loss of their natural homes. | D．People’s cutting down trees. |
| A．Reptiles are prettier than mammals. |
| B．People care more about mammals than reptiles. |
| C．Mammals are more important than reptiles. |
| D．Reptiles are better protected than mammals. |
| A．To share some good news. | B．To teach some useful skills. |
| C．To call on people to take action. | D．To give people some confidence. |
| A．Reptiles Are at Risk of Dying Out. |
| B．A New Report Showed Some Bad News. |
| C．What Should We Do to Protect Reptiles? |
| D．Why Reptiles Are in Danger? |
【推荐2】Distantly related to the larger, better-known black-and-white giant panda, the red panda is a mere creature found in the mountains of Nepal, Myanmar, and central China.
The red panda is dwarfed by the black-and-white giant that shares its name. These pandas typically grow to the size of a house cat, though their big, bushy tails add an additional 46 centimeters. They use their ringed tails as wraparound blankets in the cold mountain heights.
The red panda shares the giant panda’s rainy, high-altitude forest habitat, but has a wider range. Red pandas live in the mountains of Nepal and northern Myanmar, as well as in central China.
These animals spend most of their lives in trees and even sleep aloft. When hunting, they are most active at night as well as in the hours ofdusk and dawn.
Red pandas have a taste for bamboo but, unlike their larger relatives, they eat many other foods as well — fruit, acorns, roots, and eggs. Like giant pandas, they have an extended wrist bone that functions almost like a thumb (拇指) and greatly aids their grasp.
They are shy and alone except when mating. Females give birth in the spring and summer, typically to one to four young. Young red pandas remain in their nests for about 90 days, during which time their mother cares for them. Males take little or no interest in their young babies.
The red panda has given scientists taxonomic (分类的) fits. It has been classified as a relative of the giant panda, and also of the raccoon, with whichitshares a ringed tail. Currently, red pandas are considered members of their own unique family — the Ailuridae.
Red pandas are endangered, victims of deforestation. Their natural space is shrinking as more and more forests are destroyed by logging and the spread of agriculture.
1. Which of the following best describes the red panda?| A．Big and bushy. | B．Particular about food. |
| C．Active in the day. | D．Hard to fit into a category. |
| A．By their size. | B．By their habitat. |
| C．By the way they hunt. | D．By their wrist bone. |
| A．The raccoon. | B．The red panda. |
| C．The giant panda. | D．The taxonomic fit. |
| A．To compare a variety of pandas. |
| B．To explain the classification of pandas. |
| C．To raise awareness of protecting wildlife. |
| D．To make an introduction to a unique animal. |
【推荐3】Fritillaria plants should be simple to spot. The usually bright green plants often stand alone amid the rocks that top the Himalayan and Hengduan mountains in southwestern China — easy pickings for traditional Chinese medicine herbalists, who've ground the bulbs （鳞茎) of Fritillaria into a cough-treating powder for more than 2, 000 years. The demand for the bulbs is intense, since about 3,500 of them are needed to produce one kilogram of the powder,worth about $480.
But some Fritillaria are remarkably difficult to find，with leaves and stems that are barely distinguishable from the gray or brown rocky background. Surprisingly, the plants’ camouflage(伪装) seems to have evolved in response to people.
In wide open areas with little cover, like mountaintops, blending in can help the plants avoid hungry herbivores, says Yang Niu, a botanist at the Kunming Institute of Botany in China. But after five years of studying camouflage in Fritillaria, he did not spot any animals feeding on the plants.
So Niu, his colleague Hang Sun and sensory ecologist Martin Stevens of the University of Exeter in England decided to see if humans might be driving the evolution of the plants’ camouflage.
During their research, local herbalists noted the total weight of the bulbs harvested each year from2014 to 2019 at seven study sites. These records indicated contemporary harvesting pressure on the plants. In the meantime, the researchers assessed the ease of harvesting by recording how long it took to dig up bulbs at six of those sites. On some slopes, bulbs are easily dug up, but in others they can be buried under rocks. Both measures have revealed a striking pattern: The more harvested a site is, the better the color of a plant matches its background.
However, camouflage can present some challenges. Pollinators(花粉传播者) might have a harder time finding the camouflaged plants, and the gray and brown coloration could impair photosynthetic(光合) activity. Still, these Fritillaria show how adaptable the plants can be. The plants can better change their appearance than we might have expected.
1. What is the first paragraph mainly about?| A．The reason for picking Fritillaria. | B．The surviving skills of Fritillaria. |
| C．The history of traditional Chinese medicine. | D．The appearance of Fritillaria. |
| A．Fritillaria disguise themselves where people harvest often. |
| B．Animals drive Fritillaria to hide themselves better. |
| C．Frequent human activities make it easier to spot Fritillaria. |
| D．Fritillaria usually hide under rocks. |
| A．Plants can constantly change how they-look. |
| B．Camouflage can do harm to Fritillaria to some degree. |
| C．Fritillaria play an important role in the eco-system. |
| D．All plants are not good at camouflaging. |
| A．The Wall Street Journal. | B．The Economist. |
| C．Current Biology. | D．Conde Nast Traveler. |
【推荐1】“Most children,” Asher Svidensky says, “are a little afraid of golden eagles. However, Kazakh boys in western Mongolia start learning how to use the huge birds to hunt for foxes and hares at the age of 13.” Svidensky, a photographer and travel writer, shot five boys learning the skill as well as the girl, Ashol Pan. “To see her with the eagle was amazing,” he recalls. “She was a lot more comfortable with it, a lot more powerful with it and a lot more at ease with it.”
The Kazakhs in western Mongolia are the only people that hunt with golden eagles, and today there are around 400 practising eagle hunters. Ashol Pan, the daughter of a famous hunter, may well be the country’s only girl hunter.
They hunt in winter, when the temperatures can drop to -40℃. A hunt begins with days of traveling on horseback through a snow mountain or ridge (山脉) giving an excellent view of prey for miles around. Hunters generally work in teams. After a fox is discovered, riders rush to frighten it into the open, and an eagle is released (释放). If the eagle fails to make a kill, another is released.
“The skill of hunting with eagles,” Svidensky says, “lies in bringing an unexpected force of nature under control. You don’t really control the eagle. You can try and make her hunt an animal, and then it’s a matter of nature. What will the eagle do? Will she make it? How will you get her back afterwards?”
Svidensky describes Ashol Pan as a smiling, sweet and shy girl. “Ashol Pan stands for something about Mongolia in the 21st century,” says Svidensky. “Everything there is going to change and is going to be redefined (重新定义), and the possibility is amazing.”
1. What makes Asher Svidensky much surprised?| A．The colorful and powerful eagles. |
| B．The special way of hunting by the Kazakhs. |
| C．The wonderful performance of Ashol Pan. |
| D．The young age of Kazakh eagle hunters. |
| A．The scenery to be enjoyed. |
| B．The creature to be caught. |
| C．The option to be argued. |
| D．The future to be expected. |
| A．Man can overcome nature. |
| B．All efforts will pay off one day. |
| C．Making use of existing resources is important. |
| D．Never think about controlling others. |
| A．A photographer and travel writer’s traveling experience. |
| B．A girl eagle hunter in Mongolia. |
| C．The true life of the eagle hunters in Mongolia. |
| D．The future of the traditional way of eagle hunting. |
【推荐2】Whales are important animals in the sea. The organizations of the world are calling all nations not to kill or eat whales any more. But Japan’s new whaling(捕鲸) plan is a great danger to the living of these large animals. It will also do harm to the sea interests (利益) of other surrounding countries including China, experts said.
After the Japanese government made its decision clear on Nov. 8, 2016 to catch 100 more whales in 2017, many animal experts in the world voiced their angry answers. According to a Japan News report, Japan caught 174 minke whales and 140 sei whales totally in the northwest Pacific Ocean in 2017.
“After years of overfishing(过度捕捞),the population of minke whales in the northwest Pacific Ocean has been reduced to a dangerous level. Therefore, Japan should stop whaling in the area,” said Wang Yaming, a leader of the International Whaling Organization. According to Wang, most whales living in the northwest Pacific Ocean are migratory(迁徙的)animals，and their traveling way is very close to the land of Russia, South Korea, North Korea, Japan and China. Japan’s whaling will also have a terrible influence on those countries.
Although the world has stopped to catch and kill whales, Japan lies to others that its killing of whales is just for scientific purposes. However, many experts don’t agree with it completely. “Japan should not kill more whales, as doing so would harm the international whale resources(资源). Japan’s whaling in the northwest Pacific Ocean hasn’t drawn much more attention because it hardly influences the interests of western countries.“ Wang explained.
It is really high time for Japan to stop its whaling from now on.
1. What is the attitude of animal experts to the Japan’s whaling plan?| A．Surprised. | B．Interested. | C．Happy. | D．Angry. |
| A．About 240. | B．About 274. |
| C．About 314. | D．About 414. |
| A．Whales travel far from the land of Japan when they are migrating. |
| B．Near the land of China, people could not find any whales at all. |
| C．Overfishing made certain whales in the northwest Pacific Ocean fewer. |
| D．Japan’s whaling has nothing to do with the neighboring countries. |
| A．Scientific study. | B．Food supply. |
| C．Zoo interests | D．Sea balance. |
【推荐3】Where should an adventurous tourist go? After you've done sightseeing in London, shopping in New York, enjoyed the local food in Paris, and danced to your heart's content at the Brazilian carnival, where else can you go? What attractive tourist destination awaits you?
Well, Antarctica sounds like the holiday of a lifetime! It's considered the last great wilderness on Earth. Just a few scientists in research stations share the icy landscape with penguins and other animals which can struggle with the low temperatures.
Tourism began in Antarctica in the 1950s and it's still small part. About 37,000 tourists are expected there this season, but many won't even leave the boat.
The BBC’s Juliet Rix visited the frozen continent and asked herself if she should be there at all, causing potential problems to such a sensitive environment. Her tour guide admitted that all visitors leave a footprint and they all go to the same places, the accessible coastline, which is also where the penguins and seals go to raise.
But some people believe that if carefully controlled, tourism can be good for Antarctica. It has no native population and it needs advocates. Visitors to the icy continent might be ready to support and even to fund its preservation. And they're likely to engage in the discussion about global warming, which has led to the melting of glaciers.
According to Rix, guidelines are followed when you're about to set foot in Antarctica and tourists have to disinfect their boots to make sure no alien species are introduced.
And once on land, there's no eating or smoking. Rocks, bone fragments—nothing should be taken as a souvenir and nothing should be left behind.
Tourists fortunate enough to visit the Antarctic must be aware that this is not their home and keep their fingers crossed that future generations will also be able to enjoy such breathtaking views.
1. What can we infer from the second paragraph?| A．The Antarctic has become the best place for people to travel. |
| B．Only scientists can be allowed to go to Antarctic. |
| C．Antarctic is less affected by human activities. |
| D．No animals can survive in Antarctic expect penguins. |
| A．whether tourists should go to Antarctic or not should be considered carefully |
| B．governments should take measures to stop tourists from going to Antarctic |
| C．the animals’ habitat in Antarctic has been seriously affected by tourism |
| D．only journalists begin to pay attention to the environmental protection in Antarctic |
| A．Clean. | B．Move. |
| C．Remove. | D．Change. |
【推荐1】There’s nothing sadder than reading about a lost child in the newspaper or seeing the story of a child gone missing on the news. Fortunately for us as parents there is a way to avoid this type of tragedy through GPS tracking for children. Global positioning system technology can make it so that we need not worry about our children being lost as much as we used to in the past.
GPS systems for kids are small devices that can be worn or implanted (嵌入) in a watch or attached to the child’s clothing or backpack. It will then deliver information to you about the child’s location at all times providing you with peace of mind. The GPS systems can be programmed to send information in intervals (间隔) as short as 15 seconds.
You can imagine how much more relaxed you would be when you’re able to log (登录) into your computer at any time and know within several yards exactly where your child is. Some of the GPS kids units even have a panic button that the child can push to send an immediate alert in case of an emergency. This notification will go both to you and to the GPS tracking service so that authorities can be alerted.
For small children the GPS tracking device can be as small as a watch and will run on batteries (电池) for up to 24 hours before needing to be recharged. For older children you can even place a device in their car to monitor their driving habits and where they are driving. Personal GPS units for kids are not cheap and the smaller the device the higher the price. Can you really say that anything is too expensive when discussing the safety and well being of your children? In addition to the cost of the device you will also need to pay a fee to the GPS tracking service. In the world we live in sometimes it is difficult to be too safe and these GPS kids systems can provide many parents with added peace of mind.
1. According to the passage, what can we learn about GPS systems for kids?| A．The bigger devices of GPS units for kids usually cost more. |
| B．They are devices which can help children recognize the direction. |
| C．They are small devices through which parents can know where the child is. |
| D．Children can send information through GPS systems for kids only once a day. |
| A．Signal. | B．Plan. |
| C．Letter. | D．Machine. |
| A．GPS systems for kids are very cheap for ordinary people. |
| B．GPS systems for kids should be made smaller in size. |
| C．GPS systems for kids need more advanced batteries. |
| D．GPS systems for kids are good value for money. |
| A．Kids safety problems. |
| B．GPS systems used in education for kids. |
| C．GPS systems for kids. |
| D．Global Positioning System Technology. |
【推荐2】The cry of the fishing cat sounds like the quack of a duck, and the rest of this midsize cat also enables it to hunt in the water. Its streamlined head is perfect for moves in the mangrove swamps (红树林沼泽地) and wetlands of South and Southeast Asia, and its pointy ears even fold (折叠) down when it jumps into deep water. The short and strong tail helps control its direction. The extra-thick coat keeps it warm and dry while swimming.
“I found fishing cats to be very ingenious,” says Tiasa Adhya, co-founder of The Fishing Cat Project, a research and conservation group based in eastern India. Her research recently showed that the animal has two methods of catching fish. In deep waters, the cat stays still on the banks for hours before jumping into the water for the kill. In shallow (浅的) waters, though, the cat actively drives the fish out of their hiding places by moving about with heavy steps.
Now the fishing cat is facing another challenge: humans. The world has lost almost 90 percent of its wetlands since the 1700s, with Asia suffering the greatest loss. These days, industrialized fish farming, pollution and other human behaviors have destroyed the living condition of freshwater fish and set fishing cats against farmers, as the hungry cats steal farmed fish, and the farmers get even with them (报复). Once found along river systems from Pakistan to Vietnam, the cats have disappeared from large areas of their range.
Researchers are testing new methods, including the commercial launch (商业化推出) of a type of native rice variety. Depending on nutrients (营养物) washed in by rains rather than on chemicals, the rice creates living space for the fishing cat and its food. The idea is that in healthy lakes where there is plenty to feed fishing cats and fishermen alike, killings will be unnecessary. “Nobody takes a loss,” Adhya explains, “when somebody takes a fish.”
1. What does the author want to explain about fishing cats in the first paragraph?| A．Why they moved to South and Southeast Asia. |
| B．What helps them swim well in the water. |
| C．What pushes them to live with ducks. |
| D．Why they love staying in the water. |
| A．Friendly. | B．Alarmed. | C．Clever. | D．Lazy. |
| A．The battle between fishing cats and humans. |
| B．The decision to protect freshwater fish. |
| C．The importance of stopping pollution. |
| D．The method of increasing wetlands. |
| A．It will do some harm to the environment. |
| B．It will create a win-win situation. |
| C．It will increase food production. |
| D．It will cost a lot of money. |
【推荐3】The other day, my friend Jane was invited to a 40th birthday party. The time printed on the invitation was 7: 30 p. m. Jane went off with her husband, expecting a merry evening of wine, food and songs.
By 9: 45, everybody was having great fun, but no food had appeared. Jane and David were restless. Other guests began whispering that, they, too, were starving. But no one wanted to leave, just in case some food was about to appear. By 11: 00, there was still no food, and everyone was completely off their heads. Jane and David left hungry and angry.
Their experience suggests that the words on the printed invitations need to be made clearer. Everyone reads and understands the invitations differently. Most of us would agree that 6: 30 ~ 8: 30 p. m. means drinks only, go out to dinner afterwards; 8: 00 p. m. or 8: 30 p. m. means possible dinner, but 9: 30 p. m. and any time thereafter means to eat food beforehand roll up late.
But this is not always the case. If asked to a students' party at 6: 30 p. m. , it is normal for guests not to appear before midnight, if at all, and no one cares. Being the first to arrive - looking eager - is social death. When my mother is asked to a party for 6: 30, she likes to be there, if not no time, then no later than seven. My age group (late thirties) falls somewhere between the two, but because we still think we're young, we're probably closer to student-time than grown - up time.
The accepted custom at present is confusing, sometimes worrying, and it often means you may go home hungry, but somewhat it does leave everybady a precious surprise.
1. Which of the following is probably closest to the underlined phrase “off their heads”?| A．excited | B．crazy | C．curious | D．hopeless |
| A．very difficult | B．particularly thoughtful |
| C．friendly and polite | D．socially unacceptable |
| A．are likely to arrive late for a party | B．care little about the party time |
| C．haven't really grown up yet | D．like surprises at parties |
| A．It's safe to arrive late just when food is served |
| B．It's wise to eat something before going to a party |
| C．It's important to follow social rules of party - going |
| D．It's necessary to read invitations carefully |
【推荐1】ADULT GROUP TOURS
MIM (Musical Instrument Museum) invites groups to experience the world through music. Reserve group tours in advance to check in as a group upon arrival and expedite(加快）admissions(入场）. With easier check-in，groups have more time to explore the galleries. GUIDED TOUR
■ Length of Tour: One hour
■ Group Size: 7 guests per group; 3 groups maximum per tour (21 guests maximum at one time). Since space can be tight in those areas, the number of guests are limited at any time. “VIP” Tours are conducted in groups of seven people.
GENERAL ADMISSION
General: $20 per adult
■ $15 for teens (ages 13-19)
■ $10 for children (ages 4 - 12)
■ Free for children 3 and under TOUR FEES
A $25 fee is charged for each group that registers(登记）for this tour，plus general museum admission for each guest on the tour.
■ Group of 1-7 guests: $25 plus general admission for each guest
■ Groups of 8 to 14 guests: $50 plus general admission for each guest
■ Groups of 15 to 21 guests: $75 plus general museum admission for each guest
A $40 nonrefundable(不可退的）deposit (押金)will hold the reservation(预订）and is applied to the final payment.
TOUR SCHEDULE
Tours are available year-round, seven days a week.
Our team is delighted to adjust the time of the tour to accommodate your needs. We would be glad to help you make your tour reservation.
BOOK YOUR ADULT GROUP TOUR TODAY
To schedule a tour for your group, please fill out the Adult Group Tour Request Form at least two weeks before your desired tour date. MIM will then contact you and e-mail your reservation confirmation. If you have questions, contact MIM9s Group Sales Specialist at 480.478.6031 oradulttours@MIM.org.
1. Why is the number of visitors strictly controlled each time?| A．Because of MIM”s benefits. | B．Because visitors are rare. |
| C．Because of the visitors’ noises. | D．Because of the limited space. |
| A．$165. | B．$25. | C．$140. | D．$40. |
| A．Tours are not available during weekends. |
| B．All the children are free to enter the MIM. |
| C．You need to fill the form before the tour. |
| D．You only contact the MIM by telephone. |
【推荐2】Dogs can be trained to use their sense of smell to recognize illegal drugs and explosives. So Mark Ruefenacht wondered if the animals could also recognize changes in the blood sugar level of people with diabetes（糖尿病）.
Ruefenacht has had the disease for much of his life. In 1999, he almost died while training a young dog to be a guide dog for the blind. Without any warning, his blood sugar suddenly dropped to a dangerously low level. Luckily, his dog stayed with him, and tried to keep him awake. Finally, he was able to get his blood sugar up. This made him wonder if dogs could be trained to identify the chemical changes that happen during an attack, and then inform their owners.
To train the animals, Ruefenacht uses bottles containing swabs of sweat from a diabetic with low blood sugar, and containers of other smells, such as peanut butter, dog food, or plants. The dogs are given a treat when they choose the correct jar.
This “sweat jar” method for training diabetes detection dogs has been approved scientifically.
The next step is to teach the dog to alert the owner. The dogs are trained to use subtle（细微的）signs at first. However, if those signals are ignored, the animals then put their paws on the owner’s legs or shoulders. They learn to lick and put their nose in the owner’s face, and make noises. If none of these methods work, the dogs are then trained to find someone else to help.
Ruefenacht says the dogs can often detect blood sugar dropping long before electronic systems send a warning sound.
His group, Dogs4Diabetics, has placed more than 100 dogs with diabetics. The group hopes to expand the program — training people’s “most loyal friend” to save lives and help diabetics around the world.
1. What inspired Ruefenacht to train dogs to detect blood sugar dropping?| A．His own near-death experience. |
| B．The success in training guide dogs for the blind. |
| C．Dogs’ loyalty to their owners. |
| D．Dogs’ ability to get blood sugar up. |
| A．He rewarded the dogs if they made the correct choice. |
| B．He tested the swabs of sweat from a diabetic with low blood sugar. |
| C．He proved the “sweat jar” method in a scientific way. |
| D．He first trained the dogs to know about blood sugar. |
| A．The process of training the dogs. |
| B．The ways for dogs to inform their owners of blood sugar dropping. |
| C．The methods dogs learn to identify low blood sugar. |
| D．The result of the training. |
| A．Training dogs to help diabetics has been expanded around the world. |
| B．Dogs are far more advanced in detecting blood sugar dropping than electronic systems. |
| C．Dogs do make a big difference in many fields to help human beings. |
| D．Dogs can detect blood sugar dropping by tasting sweat from a diabetic. |
【推荐3】The Ebro Delta,known as,a battleground during the Spanish Civil War,is now the setting for a different contest,where rice farmers fight against two enemies:the rice-eating giant apple snail,and rising sell levels.What happens here will have an effect on the future of European rice production and the overall health of southern European wetlands.
Located in the Western Mediterranean,the Ebro Delta produces 120 million kilograms of rice a year,making it one of the continent’s most important rice-growing areas.As the sea moves into these fresh-water marshes(湿地),however,rising salinity(盐分)is hindering rice production.At the same time,this sea-water also kills off the greedy giant apple snail,an introduced pest that feeds on young rice plants.The most promising strategy has become to exploit one evil against the other.
The battle is currently in progress on land,in greenhouses at the University of Barcelona.Scientists working under the guidance of”Project Neurice”are seeking varieties of rice that can withstand the increasing salinity without losing the absorbency.
“The project has two sides,”says Xavier Serrat,Neurice project manager and researcher at the University of Barcelona,”the short-term fight against the snail,and a mid-to long-term fight against climate change.But the snail has given the project greater urgency.”
Originally from South America,the snails were accidentally introduced into the Ebro Delta.For now,the giant apple snail’s presence in Europe is limited to the Ebro Delta,But the snail continues its march to new territory,says Serrat.”The question is not whether it will reach other rice-growing areas of Europe,but when.”
1. What’s the most effective strategy according to Paragraph 2?| A．Beating enemies one by one. | B．Striking the stronger enemy first. |
| C．Killing two birds with one stone. | D．Using one enemy to hit the other. |
| A．It puts the control of snails first. |
| B．It functions pretty well on climate change. |
| C．It aims to increase the Spanish rice production. |
| D．It stresses the snails’effect on rice production. |
| A．It can tolerate the rising salinity. | B．It will attack other rice-growing areas. |
| C．It multiplies at a high speed. | D．It was introduced into Span deliberately. |
| A．Chemistry. | B．Tourism. | C．Farming. | D．Geography. |
