1 . When micro-plastics end up in farm fields, the pollution can damage plant growth. But two young researchers now report that combining fungi (真菌) with certain farm wastes can partly overcome that problem.
May Shin, 20, and Jiwon Choi, 18, met in a research design class at the Fryeburg Academy, a high school in Maine. May had desired to explore how micro-plastics might affect the ecosystem. Jiwon was crazy about plants and fungi. The young scientists cooperated to test how long-lived plastics might affect farm crops.
Scientists have shown certain fungi can aid root growth and a plant’s nutrient uptake. Those organisms are named arbuscular mycorrhizal fungi (AMF). Certain farm wastes, like straw, can provide nutrients to plants and help stabilize their roots. Such wastes are also known as mushroom substrate (基质) and people often grow mushrooms in them.
May and Jiwon planted over 2,000 scallion (大葱) seeds in pots of soil. Half the seeds got soil polluted with micro-plastics. The rest grew in plastic-free soil. The plants then were further divided into four groups. The young scientists added AMF to the soil in one group. Another group had a top layer of mushroom substrate. A third group got both treatments. The last group got none. For three weeks, the pair tracked how many scallions sprouted (发芽) in each group and measured the plants’ height once each week.
About twice as many scallions sprouted in clean soil compared to that containing plastic bits. But among plants surviving in the polluted soil, a combination of AMF and mushroom substrate helped them out. Those getting both treatments grew 5.4 centimeters per week. That was faster than either of the treatments alone or those getting none.
Jiwon and May then looked at the plant roots with a microscope. Where AMF had been added, it grew into those roots. That increased the scallion roots’ surface area, May said, which should promote their uptake of nutrients. So “I see this project as coming up with a sustainable solution for plant growth in polluted soils,” said May.
1. Why did May and Jiwon work together?| A．To see the effects of long-lived plastics on farm crops. |
| B．To find the relationship between plants and fungi. |
| C．To design a research on the growth of plants. |
| D．To explore the way that the ecosystem works. |
| A．To prove the existence of micro-plastics. | B．To compare fungi with farm wastes. |
| C．To tell the advantages of farm wastes. | D．To provide some related information. |
| A．Its purpose. | B．Its design. | C．Its findings. | D．Its reasons. |
| A．By keeping the plants more resistant to pollution. | B．By allowing the plants’ deep area more freedom. |
| C．By making nutrients more available to the plants. | D．By exposing the roots to a larger surface area. |
2 . Too often, houseplant decisions are made suddenly. We find a fine plant at the supermarket and say, “That’s so pretty. I want it.” So we bring home a healthy, tropical (热带的) plant only to find it, weeks later, on death’s doorstep.
Before buying a tropical plant or indoor flowering plant, look around your house and decide where you would like to see it. It is not necessary to choose the brightest place, as there are great houseplants for nearly all light conditions. After determining where new plants are needed, decide what shape the plants should be. Perhaps you need something tall to fill an empty corner or soften an empty wall.
Once you have a list of the spaces you need to fill and the plant forms you would like to try, visit the garden center or greenhouse and look at the offerings. Mid-winter is the best time for tropical plant shopping since most stores fill the gap between gardening seasons with tropical orders. Ordered a lot, they are cheaper in the winter as well.
Ask the salesman which plants are the easiest to grow; this list should include cast iron plant, parlor palms, snake plants, peace lilies and so on. Flowering plants are the most difficult to grow and should be avoided if you are new to indoor plants. If you must have one, look for Jasmine Sambac, an easy plant.
Don’t lose heart if you buy something and it doesn’t survive. Tropical plants are suited to warm, moist (潮湿的) and protected air. They are not suited to some places in hot northern homes. Remember that a lovely plant that looks good in your living room for only a year is still a better action than last night’s pizza.
1. What should we consider before buying a houseplant?| A．Its color and shape. | B．Its flowering period. |
| C．The area which it belongs to. | D．The place where we will put it. |
| A．There are more plants to choose from then. |
| B．The gardening business then is increasing. |
| C．The plants look more beautiful then. |
| D．The plants grow better then. |
| A．We’d better not buy the pizza made last night. |
| B．The living conditions are important to plants. |
| C．Few people can keep tropical plants alive. |
| D．It is wrong to keep tropical plants indoor. |
| A．Where to buy houseplants. |
| B．When to grow houseplants. |
| C．How to choose a proper houseplant. |
| D．Whether houseplants are easy to grow. |
3 . The forests of today will not be the forests of tomorrow.
Rising temperatures, deforestation (森林砍伐), development and climate-caused disasters are changing the very form of Earth’s forests, new research published in the journal Science finds.
Older, bigger trees are being lost at an amazing rate, making the planet’s forests shorter and younger in general.
The shift is being driven at different rates by different causes in different places, the study’s authors say, but the consequences will be global.
Old growth forests absorb and store massive amounts of climate-warming carbon dioxide (二氧化碳). They provide home for rare and critically endangered species and make the biology diverse. And they’re disappearing fast.
Warming temperatures, wildfires, and insect outbreaks were among the many causes of the decline, says Nate McDowell, the study’s lead author.
Just in the past year, the world has watched as massive wildfires across Siberia, the Amazon and Australia. Deforestation in Southeast Asia and Brazil continue rapidly.
Human-driven climate change is also making it difficult for many forests to fully recover from the type of natural behaviors — wind events, flooding or fire — that would normally occur.
The researchers did find evidence that increased carbon dioxide in the atmosphere could increase tree growth in some places, but not to an extent where it would outweigh the harm being done by increased temperatures. The most important trend was one of loss.
“I would recommend that people try to visit places with big trees now, while they can, with their kids,” McDowell says. “Because there’s some significant threat, that might not be possible sometime in the future.”
1. What does the author mean by saying “The forests of today will not be the forests of tomorrow”?| A．Tree species in forests will be changed as governments plan. |
| B．The climate of tomorrow will be different from that of toady. |
| C．The form of forests will be changed due to various reasons. |
| D．Animals in the forests will die away at an amazing rate. |
| A．People are planting a great deal of trees. |
| B．People are involved in protecting forests. |
| C．The growth of new trees is threatening that of big ones. |
| D．The number of older and bigger trees is dropping greatly. |
| A．They are harmful to the growth of younger trees. |
| B．They are home to many rare and endangered trees. |
| C．They rely largely upon weather conditions. |
| D．They serve as the habitats for most birds. |
| A．Because they would be impressed by their beauty. |
| B．Because they would keep away from busy life temporarily. |
| C．Because there might be no big trees at all in the future. |
| D．Because warmer climate might destroy all trees globally. |
4 . What if someone told you about a kind of grass as tall as the tallest trees? A grass as strong as steel? Would you believe that person? You should, for that grass is bamboo (竹子), which has more than 1,000 uses. It is not just a material for making useful products. Young bamboo is eaten, often mixed with other vegetables.
Bamboo grows in many parts of the world. In the USA it grows in many states like Virginia and Florida. Most bamboo, however, is found in wet and warm climates, especially in Asia and on the islands of the South Pacific Ocean.
In most Asian countries, bamboo is nearly as important as rice. This unusual material is used to not only build large buildings but also make water pipes, musical instruments and paper. There are over 1,000 kinds of bamboo. No wonder the lives of nearly half the people on earth would change greatly if there were no longer any bamboo.
1. According to the text, bamboo is actually a kind of .| A．grass | B．steel | C．tree | D．vegetable |
| A．Only in Asia. | B．Only in the USA. |
| C．In wet and warm climates. | D．All over the world. |
| A．Build large buildings. | B．Make water pipes. |
| C．Make musical instruments and paper. | D．All of the above. |
| A．Over 1,000. | B．Over 800. | C．Over 600. | D．Over 400. |
5 . Animals can adapt quickly to survive unfavorable environmental conditions. Evidence is mounting to show that plants can, too. A paper published in the journal Trends in Plant Science details how plants are rapidly adapting to the effects of climate change, and how they are passing down these adaptations to their offspring(后代).
Plants are facing more environmental stresses than ever. For example, climate change is making winters shorter in many locations, and plants are responding. “Many plants require a minimum period of cold in order to set up their environmental clock to define their flowering time,” says Martinelli, a plant geneticist at the University of Florence. “As cold seasons shorten, plants have adapted to require shorter periods of cold to delay flowering. These mechanisms allow plants to avoid flowering in periods when they have fewer opportunities to reproduce.”
Because plants don’t have neural(神经的) networks, their memory is based entirely on cellular(细胞的),molecular(分子的),and biochemical networks. These networks make up what the researchers call somatic memory(体细胞记忆). “It allows plants to recognize the occurrence of a previous environmental condition and to react accordingly,” says Martinelli.
These somatic memories can then be passed to the plants’ offspring via epigenetics(表现遗传). “Several examples demonstrate the existence of molecular mechanisms modulating plant memory to environmental stresses and affecting the adaptation of offspring to these stresses,” says Martinelli.
Going forward, Martinelli hopes to understand even more about the genes that are being passed down. “We are particularly interested in decoding the epigenetic alphabet without changes in DNA sequence(序列),”he says. “This is especially important when we consider the rapid climate change, we observe today that every living organism, including plants, needs to quickly adapt to survive.”
1. What adaptations have plants made to shortened cold seasons?| A．They have shortened their flowering time. |
| B．They have got more chances to reproduce. |
| C．They have avoided flowering in cold seasons. |
| D．They have adjusted their environmental clock. |
| A．It is entirely based on neural networks. |
| B．It can help the plants’ offspring to survive. |
| C．It can help relieve environmental stresses. |
| D．It disturbs the plants’ biochemical networks. |
| A．Adjusting. | B．Treasuring. |
| C．Recording. | D．Sharing. |
| A．Plants are smart about flowering time |
| B．Plants can also adapt to climate change |
| C．Environmental stresses challenge plants |
| D．Mysteries of plant genes are to be unfolded |
6 . Though they may not know it, about half a billion people depend on the ecosystems created and sustained by corals. And with climate change threatening coral’s survival, marine scientist Enric Sala had a goal that might have seemed impossible.
“We wanted to get into a time machine, go back hundreds of years and actually see a coral reef like they used to be everywhere, before we started exploiting, polluting and killing them,” Sala said.
The goal was made possible during an expedition Sala led in 2009. The team traveled to a corner of the South Pacific Ocean, to see if the almost untouched reefs held any clues to bringing damaged reefs in other parts of the ocean back to health.
“The bottom was covered by thriving coral. Vivid colors surrounded me－purples, reds, oranges, yellows and greens. It was so beautiful,” Sala said.
His team presented their findings to officials in the island country of Kiribati. The government took steps to protect the waters from fishing. But between 2015 and 2016, record levels of ocean warming damaged half the coral reefs the team had been studying.
After hearing that news, they lost hope for the health of coral reefs. Last year, they went in for another dive. Despite the reported conditions, the reef had somehow restored itself, filled with life and color once more. Sala and his team were overjoyed. This is something that Sala says can be owed to two key factors.
The first is, thankfully, half of the corals had not died. Despite the rise in temperatures, there were enough surviving corals left behind to help reproduce the reefs. The second was the Kiribati government’s decision to fully protect those waters.
“It has an abundance of fish. So they were eating all the algae (藻类) that would cover the dead corals, and make it impossible for the corals to come back, which is what happens in other places like the Caribbean,” Sala explained.
1. What seemingly impossible goal does Sala have?| A．Educating the public to protect the ecosystems. |
| B．Calling on people to actively respond to climate change. |
| C．Going to old days when corals were in healthy condition. |
| D．Leading an expedition to the South Pacific Ocean. |
| A．The bad news. | B．The second diving. |
| C．The reef’s restoration. | D．The cheerful mood. |
| A．There is abundant fish in its ocean. |
| B．Algae lie thick over corals there. |
| C．Global warming does little harm to its marine life. |
| D．Corals come back to life thanks to government’s efforts. |
| A．Kiribati—A Country of Biodiversity | B．A Scientist’s Love for Diving |
| C．The Coral Reef Restored Itself | D．Ocean Warming Bothered Government |
7 . The story started from a popular video, in which a tourist pulled a flower out of the ground in Tibet and boiled it with other food.
He might not know what he dug up was not an ordinary one but snow lotus, an extremely rare species. The exact number existing in the wild is unknown, but scientists believe that the species is dying out and people are not allowed to collect them for private or even scientific use since 2000.
The snow lotus generally only grows above the snowline of the Tibetan Himalayas or Heaven Mountain in Central Asia. In order to survive the harsh environment and strong wind, it grows thick hair on the outside, which keeps the plant from the cold. And it often has to grow around six to eight years before its only flowering time in life.
Only very few plants and animals survive in such an environment. Therefore, each snow lotus is key part of fragile (脆弱的) ecosystem around it. When someone digs one out of the ground, he/she not only wastes the plant’s own years of efforts, but also threatens the ecological (生态的) balance of about one square kilometer around it.
For a long time, many people collect the lotus flowers to sell as herbal (药草的) plants to others, even though their herbal effects are not proved. Regardless of the fact, some traders do misleading advertising about them and illegally sell them at high prices. As a result, the species is in danger. The snow lotus is not the only plant that suffers from the illegal sale of certain people because they carry a sense of mystery. It is time the law offered stricter protection of these rare plants for the ecological environment.
1. What did the author intend to tell us about the tourist?| A．He destroyed an endangered plant. | B．He has good outdoor survival skills. |
| C．He discovered a special kind of flowers. | D．He has made many popular short videos. |
| A．To fight for enough living space. | B．To make the flower less obvious. |
| C．To protect it from extreme conditions. | D．To prevent it from being dug out easily. |
| A．It is hard for people to find a snow lotus. |
| B．It takes many years for a snow lotus to fully grow. |
| C．Some rare plants usually grow in weak environments. |
| D．The snow lotus is very important to the local ecosystem. |
| A．We should call on the public to protect rare plants. |
| B．We should learn to recognize different plants. |
| C．We should follow all the laws in our country. |
| D．We should avoid taking wild plants as food. |
8 . As we sip our coffee and read the daily headlines, climate changes can seem like a distant threat. But travel a few thousands miles to the source of your caffeine fix, and the threat is all too real.
The coffee farmers are now seeing violent downpours that drown their plants in Mexico, where the climate used to be stable and mild, but the temperature now see-saws between extreme cold and heat, which greatly affects their harvest. Unfortunately, farmers across South America, Asia and Africa are also watching coffee plants decrease as droughts and downpours attack their crops as a result of global warming. The consequences of all this could soon work their way through the pipeline to your local coffee shop.
The problem arises, in part, from refinement (改进) of our taste. Two main breeds of commercial coffee Arabica and Robusta gain special reputation. The former is by far the world’s favourite, accounting for about 70% of the coffee we drink. However, the Arabica plants have been bred from a very small stock taken from the mountains of Ethiopia-giving it very little genetic diversity and making it particularly difficult to adapt to climate change. Besides, the plant grows best between a very narrow range of relatively mild temperatures (18 to 22℃ ) and needs gentle, regular rainfall. The delicate Arabica plants just can’t cope with the new and unpredictable conditions that come with global warming.
All of these paint a depressing picture for the future. Researchers predict that the land suited to farming Arabica could drop by as much as 50% by 2050. Classic coffee-producing region, such as Vietnam, India and most of Central America, will be hit particularly hard. Some of the farmers feel that the subject has almost become taboo, “We talk very little about climate. We already know how it is—and that there is nothing we can do.”
1. What does the author imply at the beginning?| A．The origin of coffee is at risk. |
| B．Coffee consumers like reading newspaper. |
| C．The origin of coffee is visited by consumers. |
| D．Coffee consumers do care about the weather very much. |
| A．They become victims of extreme weather. |
| B．Those in Mexico suffer the greatest loss. |
| C．Some of them take measures to cut the losses. |
| D．They try to meet the market demand for coffee. |
| A．Its market share is low. |
| B．It can only be planted in Etiopia. |
| C．It has disease-causing genes. |
| D．It has high demands for environment. |
| A．easily understood. | B．rarely mentioned. |
| C．hardly avoided. | D．heatedly discussed. |
9 . Every year the Royal Botanic Gardens, Kew, and the New York Botanical Garden open their doors to thousands of visitors. They go there for the world-famous orchid (兰花) shows. But these organizations are not just protecting living plants but also recording the culture connected with them.
Working with the Institute of Medicinal Plant Development, Beijing, Kew has developed a collection of plants--including orchids. The plants are collected in the forms they are used in traditional Chinese medicine. This is a storehouse of medical knowledge and a tool for cultural research.
Dr. Barnabas Seyler, assistant researcher in the department of environment at Sichuan University, believes in the key role of botanical gardens. As an ethnobotanist (民族植物学家), Seyler is looking at the relationship between orchids and local culture of Liangshan. “They can help the culture continue to exist through providing protection, educating the general public, and supporting traditional knowledge, stories, and cultural traditions connected with these plants,” he says.
In China, orchids are more than just wild plants. “If you walk into any Chinese-restaurant around the world, or into any teahouse in China, you will likely find paintings, place settings, or other cultural things showing orchids,” he says. “Many people, especially in the west, do not fully understand the weight that the plant has held throughout history in traditional Han Chinese culture.
The researchers have noticed that orchid species native to Sichuan are disappearing rapidly. Their beauty is killing them. Wild-collected rare forms could be sold for thousands of dollars. In his study, Seyler asked locals of Yiand Han communities whether they could recognize different orchid species. They also asked them about how to find and grow orchids, and knowledge about orchids in arts and language. They found that when species were locally dying out, knowledge about them would be forgotten.
Culture doesn't soon disappear because of the loss of one plant or group of plants. But what happens if species loss continues?
1. Why does the author mention the collection of plants?| A．To explain why the two orchid shows are so popular. |
| B．To explain how Kew saves living plants across the world. |
| C．To show the importance of working with foreign countries. |
| D．To show how botanical gardens are protecting the environment. |
| A．They can help keep orchid culture alive. |
| B．They will win more support from the public. |
| C．They should pay more attention to local cultures. |
| D．They can play a key role in environmental protection. |
| A．The long history of orchids in China. |
| B．The many uses of orchids in the world. |
| C．The importance of orchids in Chinese culture. |
| D．The great influence of orchids on Western people. |
| A．How to prevent orchids from dying out. |
| B．What will happen to orchids in Sichuan. |
| C．How to increase knowledge about orchids. |
| D．What the loss of orchids will bring about. |
