Baby giraffes inherit aspects of their mothers’ patterning—which could give them a survival advantage if good camouflage runs in the family. Just like humans have unique sets of fingerprints, every giraffe has a unique set of spots.
Derek Lee is a wildlife biologist and population ecologist at Penn State, and with the Wild Nature Institute, a research consulting group. He and his colleagues have been tracking giraffes for seven years, throughout 1,500 square miles in Tanzania.
Now, they’ve used image analysis software to study the spots of mothers and their babies. And they found that baby giraffes inherit at least some particular elements of their patterning from their mothers, like how circular the spots are. They also found that baby giraffes with larger spots have better chance to survive their first months, because the spots are more like the dappled sunlight in the bushes where baby giraffes like to hide from hungry lions and hyenas(wild animals like dogs).
The results—and a lot of giraffe patterns—are recorded and explained in the journal Peer J.[Lee et al., Seeing spots: quantifying motheroffspring similarity and assessing fitness consequences of coat pattern traits in a wild population of giraffes (Giraffa camelopardalis)]
It’s perhaps not surprising that a physical characteristic that protects an individual from being eaten passes the test of Darwinian natural selection—and get passed along to later generations. “The fact that these things are inheritable and they do affect survival of baby animals makes us feel like evolution is embodied exactly by these spot features.” So if a mom’s camouflage is good, her babies, too, might have the spots that keep them safer.
1. Why are baby giraffes with larger spots more likely to survive?A.Because their mothers tend to protect them more. |
B.Because they keep away from lions and hyenas. |
C.Because their spots match surroundings better. |
D.Because they barely move around in the bushes. |
A.Summarize the previous paragraphs. | B.Add some background information. |
C.Introduce a new topic for discussion. | D.Provide evidence for the findings. |
A.Promoted. | B.Prevented. | C.Questioned. | D.Represented. |
A.Animals Have Their Unique Sets of Patterning |
B.Derek Lee Has Been Studying Animal Patterning |
C.Mom’s Genes Make Some Giraffes Hard to Spot |
D.Animal Physical Characteristics Are Similar to Family’s |
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【推荐1】It isn’t just people who get road rage. Robins, a kind of small brown European bird, in the countryside become more aggressive when they hear the sound of traffic, according to a study.
When a robin arrives uninvited on another bird’s territory, they adapt their songs to ward the rival away, and adopt visual displays including swaying from side to side and threateningly baring their red chest feathers, before closing in and even going on the attack. Previous studies had found that robins living in cities were more physically aggressive than their rural cousins. The latest research suggests that noise pollution could play a part.
To explore the connection, scientists from UK and Turkey put a 3D-printed plastic model of a robin on another robin’s place at two locations: an urban park in Istanbul that was close to busy roads, and a quiet wooded area outside the city. The model intruder (闯入者) was also equipped with recordings of robin songs. Then, through a separate speaker nearby, they added traffic noise.
“In normally quiet surroundings, we found that additional traffic noise leads to rural robins becoming more physically aggressive, for instance approaching the model bird more closely,” said Dr Çağlar Akçay, the study’s lead author. But when they played the extra traffic to the urban birds, they did not become any more aggressive-instead they responded by singing less, suggesting they had perhaps learned to “sit out” temporary increases in noise.
Akçay and his team believed that the traffic noise was interfering with robins’ natural communication through song. “The high levels of noise that exist day and night in urban habitats, such as from traffic or construction equipment, may permanently interfere with the efficient transmission of acoustic (声音的) signals and this is likely to be the key reason why urban robins are typically more aggressive than rural birds,” he said.
1. What kind of bird are robins?A.Mild. | B.Competitive. | C.Cooperative. | D.Graceful. |
A.By analyzing previous research data. | B.By citing the famous scientists’ words. |
C.By comparing robins’ different responses. | D.By recording the model intruder’s behavior. |
A.Sing not as frequently as usual. | B.Ward the rival away by singing more. |
C.Sway more violently from side to side. | D.Approach the model bird more closely. |
A.Unclear. | B.Indifferent. | C.Optimistic. | D.Concerned. |
【推荐2】The tickbird and the giraffe have a connection relationship that some scientists describe as win-win relationship and some as parasitism (寄生). This interspecies partnership is imbalanced in favor of the giraffe because it can live without the tickbird, while the tickbird is dependent on the giraffe for food resource.
The giraffe is a large mammal that lives in Africa along with other large grass-eaters. All these and many others host the tickbird. This bird has long been thought to remove ticks (扁虱) from its host, to the benefit of both—the bird eats the ticks, and the host is relieved of blood-sucking, disease-carrying insects—but recent studies reveal that this process is less than good. A secondary benefit to a host from the tickbirds’ presence is a sort of early warning system, since the birds make a loud sound if they sight an enemy. This is of less benefit to the giraffe than to other hosts because the giraffe has the advantage of great height and keen eyesight and is fully capable of spotting predators without the bird’s assistance. The tickbird is likely of greater benefit in this capacity to the nearsighted rhino.
They cross through the host’s hair looking for insects as their food. According to the researcher Paul Weeks, reporting in the journal Behavioral Ecology, tickbirds can and do enlarge tick bites and other wounds on their host body to seek for food resource, making the host-tickbird relationship unfair. The host, like the giraffe, however, would have a hard time keeping tickbirds off itself. So they tolerate the birds who cling to their bodies and chow down selectively at the buffet on the giraffe’s body.
1. Which statement about the tickbird is TRUE?A.It doesn’t rely on the giraffe for food. |
B.It removes ticks from its hosts. |
C.It makes gentle sounds when it spots an enemy. |
D.It brings more benefit to its hosts than it gets from them. |
A.Because the giraffe has no tick on its body. |
B.Because the giraffe has its own warning system. |
C.Because the giraffe is tall and has sharp eyesight. |
D.Because the giraffe is strong enough to protect itself. |
A.stick to | B.lead to | C.keep away | D.hold back |
A.Tickbird and Giraffe: Unequal Relationship | B.Tickbird and Giraffe: Friendly Relationship |
C.Tickbird and Giraffe: Mysterious Relationship | D.Tickbird and Giraffe: Conflicting Relationship |
【推荐3】As autumn goes about its business of steadily ruining the garden, ready for the winter shut down, it's time for us to start planning some spring colour.
At the top of the list marked "easy”, we have bulb planting, with the ever popular tulip(郁金香)being the flower we will turn to most frequently. There really aren't many requirements in special gardening skills ---but to maximise your successes, there are a few simple guidelines for you.
When to plant
You'd better plant your tulip bulbs between September and November. You'll know this because your local garden center is likely to have cleared space for large buckets loaded with bulbs promising a huge variety of colourful blooms.
Choosing your site
Tulips look best in borders or containers, planted with greenery neighbors. As a couple of tulips tend to have a lost and lonely look to them, so either give them a patch where you can create an oasis of colour, or combine them with an area of other plants where their cheerful blooms will brighten the scene.
Caring for your tulips
The bulbs in your borders won't need much attention, except watering if the ground dries out, which rarely happens during a tulip's lifetime. For extra healthy plants, give them the occasional feed when they start growing. Container grown tulips will almost certainly need watering. And you'll need to move them into a shelter to avoid too much water if there are signs that they're already getting saturated with rain.
1. Why does the author recommend tulip in the passage?A.It is the only sign of spring colour. |
B.It is easy to grow and keep. |
C.It is the biggest gardening success. |
D.It can bloom throughout the winter. |
A.Planting them alone. |
B.Growing them in special containers. |
C.Watering them when necessary. |
D.Keeping them off longtime sunlight. |
A.very clean | B.completely wet |
C.much taller | D.a little dry |
【推荐1】As Internet users become more dependent on the Internet to store information, are people remember less? If you know your computer will save information, why store it in your own personal memory, your brain? Experts are wondering if the Internet is changing what we remember and how.
In a recent study, Professor Betsy Sparrow conducted some experiments. She and her research team wanted to know the Internet is changing memory. In the first experiment, they gave people 40 unimportant facts to type into a computer. The first group of people understood that the computer would save the information. The second group understood that the computer would not save it. Later, the second group remembered the information better. People in the first group knew they could find the information again, so they did not try to remember it.
In another experiment, the researchers gave people facts to remember, and told them where to find the information on the computer. The information was in a specific computer folder (文件夹). Surprisingly, people later remembered the folder location (位置) better than the facts. When people use the Internet, they do not remember the information. Rather, they remember how to find it. This is called "transactive memory (交互记忆)".
According to Sparrow, we are not becoming people with poor memories as a result of the Internet. Instead, computer users are developing stronger transactive memories; that is, people are learning how to organize huge quantities of information so that they are able to access it at a later date. This doesn't mean we are becoming either more or less intelligent, but there is no doubt that the way we use memory is changing.
1. The passage begins with two questions to ______.A.introduce the main topic | B.show the author's attitude |
C.describe how to use the Interne. | D.explain how to store information |
A.keep the information in mind |
B.change the quantity of information |
C.organize information like a computer |
D.remember how to find the information |
A.We are using memory differently. |
B.We are becoming more intelligent. |
C.We have poorer memories than before. |
D.We need a better way to access information. |
【推荐2】Imagine an oxygen mask drops down right in front of you. What’s happened? Yes, a plane crash. But the chances of being killed are very slim. You’re more likely to drown in a bubble bath, choke on your breakfast or die in a car accident on your way to the airport.
●
Your flip-flops (人字拖) may be comfortable, but they’re not going to perform well in case of an emergency. And neither will your high-heeled shoes. It’s reported that 68% of passengers in plane accidents die from injuries in post-crash fires. So go for long pants and long-sleeved shirts — they’ll protect you from flames and sharp objects.
●Be wise about where your seat is.
Where is the safest place to sit? According to Popular Mechanics, your best bet is to sit as far back in the airplane as possible unless the plane goes down tail-first. There is no such thing. It all really depends on the situation. Regardless of what section you’re sitting in, know where the emergency exits are.
●Save yourself not your possessions.
If you get to evacuate (撤离) from the plane, do it as quickly as possible. Don’t try to get your carry-on to take with you.
●Stay awake during take-off and landing.
The first three minutes after take-off and the eight minutes before landing are the most dangerous times of the entire flight. Make sure to keep your shoes on, your seatbelt fastened. Put your carry-on items under the seat in front of you to keep your legs from being broken. And pay attention to the emergency instructions.
A.Count the rows to the closest one. |
B.After all, life is full of dangers like those. |
C.You’ve been on a plane many times before. |
D.Dress as if you have to run away from a fire. |
E.Put on lace-up shoes in case you need to run. |
F.Yet we can all feel nervous when stepping on a plane. |
G.You might end up getting stuck with it in the time you waste. |
【推荐3】The Oxford English Dictionary defines awe as a feeling of religious respect mixed with fear or wonder. Now a research, done by teams from the University of California Berkeley and UC Irvine, found that experiencing awe might make people help each other out more.
“Our investigation indicates that awe serves a vital social function.” said Paul Piff, an assistant professor of psychology and social behavior at UC Irvine. “By decreasing the emphasis on the individual self, awe may encourage people to give up strict self-interest to improve the well-being of others.”
After showing participants images of nature, Piff and his team asked questions. The researchers measured moral behavior. And they measured generosity. Those who reported feeling a sense of awe showed more moral behavior.
Awe is defined partly by the fear one feels in the face of something larger than themselves. In fact, the same generous behavior was observed in people who were shown scenes of natural disasters. According to Hoffman, whether it was watching scenes of the Amazonian rainforest or a violent volcanic eruption, participants were more willing to share resources with each other afterwards.
Awe doesn’t just inspire moral behavior. Recent studies suggest that experiencing awe may promote your immune system. And it could make you feel more creative, too. It can even make you feel that you have more time to get things done.
“When people experience awe, they really want to share that experience with other people, suggesting that it has this particularly great part much like virus.” Piff tells Hoffman. “Maybe this is another way that awe binds people together—by causing people to want to share their positive experiences collectively with one another.”
1. What is the purpose of paragraph 1?A.To stress the function of awe. | B.To show the application of awe. |
C.To introduce a finding of awe. | D.To state the importance of awe. |
A.Awe helps people to be generous. | B.Awe raises one’s social position. |
C.Awe allows one to grow stronger. | D.Awe enables one to be successful. |
A.It has an internal principle. | B.It has an influential power. |
C.It has a widespread flavour. | D.It has a distinct limitation. |
A.The Origins of Awe | B.The Varieties of Awe |
C.The Changes of Awe | D.The Advantages of Awe |
【推荐1】When you picture farm, do you think of lush (郁郁葱葱) fields and big red barn? The farms of the future may look very different from that.
That’s because farms do not have to be outside anymore. They also don’t have to be above ground. In London England, 100 feet below the streets there was a huge empty space. It was built to serve as a bomb shelter during WWⅡand was unused for almost 70 years before it was turned into the world’s first underground farm according to This is Colossal.
Businessmen Richard Ballard and Steven Dring thought it would be an ideal spot to build a hydroponic farm, after all, these types of farms are thriving in warehouses and other indoor spaces. They call the company Growing Underground. Founded in 2015, but currently raising investment funds to expand, Growing Underground’s farm grows microgreens and salad leaves using hydroponic technology that grows plants in water and not soil. In fact, the company said that its hydroponic technology allows for the perfect pest-free growing environment in the underground tunnels.
These methods save 70 percent less water than traditional field agriculture and all the nutrients are kept within a closed loop system. They can grow the greens year-round because they are not affected by weather or growing seasons. But it is the LED lighting system that is the key to growing food indoors or underground.
The company’s mission is to become completely carbon neutral, which means keeping food local. They say that all of the greens can be in your kitchen within four hours of being picked. They currently sell to wholesalers local restaurants and people who live in London through Farmdrop but they hope to be entering the local retail markets soon.
1. What do we know about the London underground farm?A.It had been abandoned for long. | B.It played a key role in WWII. |
C.It was a perfect place choice. | D.It cost lot less labor. |
A.Employees. | B.Money. | C.Equipment. | D.Customers. |
A.A growing method. | B.The best environment. |
C.Advantages of the farm. | D.The LED lighting system. |
A.Meeting local needs. |
B.Reducing pollution. |
C.Choosing enough wholesalers. |
D.Drawing lots of interest from the locals. |
【推荐2】How does an ecosystem (生态系统) work? What makes the populations of different species the way they are? Why are there so many flies and so few wolves? To find an answer, scientists have built mathematical models of food webs, noting who eats whom and how much each one eats.
With such models, scientists have found out some key principles operating in food webs. Most food webs, for instance, consist of many weak links rather than a few strong ones. When a predator (掠食动物) always eats huge numbers of a single prey (猎物), the two species are strongly linked; when a predator lives on various species, they are weakly linked. Food webs may be dominated by many weak links because that arrangement is more stable over the long term. If a predator can eat several species, it can survive the extinction (灭绝) of one of them. And if a predator can move on to another species that is easier to find when a prey species becomes rare, the switch allows the original prey to recover. The weak links may thus keep species from driving one another to extinction.
Mathematical models have also revealed that food webs may be unstable, where small changes of top predators can lead to big effects throughout entire ecosystems. In the 1960s, scientists proposed that predators at the top of a food web had a surprising amount of control over the size of populations of other species—including species they did not directly attack.
And unplanned human activities have proved the idea of top-down control by top predators to be true. In the ocean, we fished for top predators such as cod on an industrial scale, while on land, we killed off large predators such as wolves. These actions have greatly affected the ecological balance.
Scientists have built an early-warning system based on mathematical models. Ideally, the system would tell us when to adapt human activities that are pushing an ecosystem toward a breakdown or would even allow us to pull an ecosystem back from the borderline. Prevention is key, which scientists says because once ecosystems pass their tipping point (临界点), it is remarkably difficult for them to return.
1. What have scientists discovered with the help of mathematical models of food webs?A.The living habits of species in food webs. |
B.The rules governing food webs of the ecosystems. |
C.The approaches to studying the species in the ecosystems. |
D.The differences between weak and strong links in food webs. |
A.has a wide food choice | B.can easily find new prey |
C.sticks to one prey species | D.can quickly move to another place |
A.The prey species they directly attack will die out. |
B.The species they indirectly attack will turn into top predators. |
C.The living environment of other species will remain unchanged. |
D.The populations of other species will experience unexpected changes. |
A.By getting illegal practices under control. |
B.By stopping us from killing large predators. |
C.By bringing the broken-down ecosystems back to normal. |
D.By signaling the urgent need for taking preventive action. |
【推荐3】Sharing Joy with Others
Ah Nao is a “furry” (兽迷). At Super Furry Fusion, the biggest furry party in China, Ah Nao dressed up in an animal suit, performed on stage, met friends and played games. “It was the happiest time I’ve ever had,” he told TMPost.
Furries are fans of animal characters from movies, books and video games. They enjoy wearing animal costumes and role-playing. They also draw or write furry artwork and stories. “People are like families in this community and we can really be ourselves here.” said Ah Nao.
Many young people, especially those born after the year 2000, have created all kinds of similar communities based on niche (小众的) interests. These can include hanfu, voice acting, and even pen spinning.
Hui, another young person born after 2000, is the head of a community called “Home to Pen Spinners”. In this community, people share videos of their performances and learn more difficult tricks from each other. Earlier this year, Hui led two Chinese teams to the sixth Pen Spinning World Cup. Sixteen teams from 11 countries, including the US, Japan and France, took part. The Chinese teams won sixth and seventh places.
“Young people have a strong need to build their identity (身份认同感). In these communities they can have a sense of belonging and find better ways to express themselves.” wrote Yu Tao, a PhD in cultural studies at Heilongjiang University.
“People group together based not on birthplaces, family background or any other factors, but simply on the same interests.” Yu wrote. As Chi Benben, another furry, told TMPost, “The circle welcomes everyone. Some furries feel inferior (自卑的) in day-to-day life, perhaps because they are fat or disabled in some way. But they can all make friends and have fun here.”
1. What do “furries” do?A.Play with animals. | B.Feed furry animals. |
C.Dress up in animal costumes. | D.Write articles of protecting animals. |
A.money | B.interests | C.birthplaces | D.background |
A.Because they are full of energy. |
B.Because they like to play games. |
C.Because they are fat or disabled in some way. |
D.Because they are eager to be accepted and listened to. |