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题型:阅读理解-阅读单选 难度:0.4 引用次数:171 题号:18155744

Every spring, as the weather warms, trees up and down the East Coast explode in a display of bright green life as leaves fill their branches, and every fall, the same leaves provide one of nature’s great color displays of vivid yellow, orange and red.

Thanks to climate change, the timing of these events has shifted over the last two decades, Harvard scientists say.

Andrew Richardson, an associate professor of organismic and evolutionary biology, and research associate Trevor Keenan worked with colleagues from seven different institutions on a study which found that forests throughout the eastern United States are showing signs of spring growth dramatically earlier, and that the growing season in some areas extends further into the fall.

Richardson said, “Climate change isn’t just about warmer temperatures. It’s also about changes in precipitation (降水) patterns... so in the future, an earlier spring might not help forests take up more carbon dioxide if they end up running out of water in mid-summer.”

The research combined information from three sources. Using satellite data, Keenan tracked when forests across the region began to turn green in the spring, and when leaves began to turn yellow in the fall. Ground observations made every three to seven days at the Harvard Forest in Petersham and a long-term research site in New Hampshire provided information about the state of buds, leaves and branches. When combined with records from instrument towers, the data sets allowed the researchers to paint a richly detailed picture that shows spring starting earlier, and the growing season lasting longer than at any point in the past two decades.

Another important result, Richardson said, was the discovery of a significant source of error in existing computer models on how forest ecosystems work.

“This shows an opportunity to improve the models and how they simulate how forests will work under future climate scenarios forecast.” he said.

The real power of the findings, however, may be in helping to make the effects of climate change clearer to the public, the researchers said.

1. What is the reason of the earlier spring according to the Harvard scientists?
A.The human activities.B.The climate change.
C.The tree growth.D.The reduction in water.
2. What can we infer from Richardson’s words in the fourth paragraph?
A.An earlier spring can only bring benefits.
B.The influence of climate change is complex.
C.The water in mid-summer will increase.
D.The role of forests becomes less important.
3. What is closest in meaning to the underlined word simulate in the seventh paragraph?
A.ChangeB.ExplainC.ImitateD.Create
4. What is the real power of the findings of the research?
A.It helps scientists to figure out how forest ecosystems work.
B.It reflects how the growing season is extending faster.
C.It provides an opportunity to improve the computer models.
D.It helps to make the effects of climate change clearer to the public.
5. What is the purpose of this text?
A.To tell us people should be more aware of the climate change.
B.To tell us the climate change has some effects on the world.
C.To tell us the early spring in eastern USA is a good time to travel.
D.To tell us high technology is useful to detect the climate change.
【知识点】 环境保护 记叙文

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阅读理解-阅读单选(约380词) | 较难 (0.4)

【推荐1】Zulema Munoz collects seaweed in a small coastal town 100 miles south of Santiago, Chile. A good week may see her cut 1,100 pounds of seaweed from the rocks where it grows.

Muftoz is one of the 30, 000 people for whom Chilean seaweed industry provides a livelihood. Throughout Latin America, the cultivation (种植) and collection of seaweed are gaining a support both as a source of food and as a means of ensuring food security in a region where 34 million people are food insecure and poverty affects 47 percent of the rural population. Countries such as Argentina, Brazil, Colombia, Cuba, Ecuador, Mexico, Peru, and Venezuela have all explored seaweed production for food. Yet as demand outpaces production and wild stocks have declined, more attention is being paid to sustainable cultivation and harvesting methods that can keep the industry surviving.

Seaweed has a long history in South American style of cooking. The native cooking of Chile made frequent use of cochayuyo, the most abundant of the country 750 types of seaweed. Today, cochayuyo is commonly found in place of meat incharquican, a traditional dish cooked slowly in a closed pan.

Kelp, a type of large brown seaweed, as the new vegetable is a global trend too, and for good reason. Nutritionally, seaweed is packed with iodine and other nutrients, and appears on trend-making menus in Google's New York cafeteria, though it used to be thought difficult to get people to eat it.

While 83 percent of cultivated sea vegetables are produced for human consumption, we aren’t just eating it. Seaweed is used in fertilizers and animal feed, and seaweed-based food additives are likely in many products in your kitchen and bathroom right now. Carrageenan, made from red seaweed, is in everything from shampoo and toothpaste to ice cream and some hot dogs.

While seaweed grows readily—there are concerns that humans are taking too much of the wild stuff. It is possible that overexploitation of natural seaweed resources could lead to significant ecological, economic, and social consequences at local, regional, and even global scales. In Latin American countries like Brazil and Peru, where the seaweed industry is based on harvesting wild seaweed rather than cultivated, the need for environmentally friendly models is urgent.

1. What do you know about seaweed?
A.It is hard to grow.B.It is good to health.
C.It tastes delicious.D.It costs a great deal.
2. What can we learn from the passage?
A.How people collect weed.B.What people do with seaweed.
C.How people cook with seaweed.D.Where people trade seaweed.
3. Why is seaweed cultivated according to the passage?
A.To make the best of the seas and to increase the export of seaweed.
B.To help more people out of poverty and to open up its new markets.
C.To meet the needs of the market and to preserve the wild resources.
D.To cut the costs of seaweed industry and to benefit rural population.
2017-12-14更新 | 196次组卷
阅读理解-阅读单选(约360词) | 较难 (0.4)
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【推荐2】The sunflower sea star has been listed as a critically endangered species following a groundbreaking population study led by Oregon State University (OSU) and The Nature Conservancy.

“These giant sea stars used to be easy to find and were a hit with divers. Unfortunately, your chances of finding one now are next to nothing in most of the areas near the United States—this listing is one step to extinction—and I don’t think they’re coming back without help,” said OSU’s Sarah Gravem, a research associate in the College of Science and the lead author of the study.

Populations of the sunflower sea star suffered dramatic crashes because of a marine (海洋的) wildlife epidemic event, which began in 2013. Scientists used more than 61,000 population surveys from 31 data sets to calculate a 90.6% decline in the sunflower sea stars and estimated that as many as 5.75 billion animals died from the disease, whose cause has not been determined. Moreover, the research showed no sign of population recovery in any region in the five to seven years since the event.

Sunflower sea stars are a key catcher of purple sea urchins (海胆) and the sea star decline has helped the increase in the urchin population in many regions. Too many urchins are linked to a decline in kelp forests(海藻林) already facing pressure from marine heat wave events, making the future uncertain for ecosystems that provide habitat for thousands of marine animals and help support coastal economies.

“Because most people are not out in the ocean every day, we don’t realize how much it’s being changed and impacted by humans. We need to think about how to keep our ocean healthy. While reducing the release of carbon dioxide is the most pressing need, rebuilding key catcher populations, like the sunflower sea star, can be an important piece of the puzzle too,” said study co-author Sara Hamilton, a Ph. D. candidate in the OSU College of Science.

1. What can we infer about sunflower sea stars from Sarah Gravem’s words?
A.They present a danger to divers.
B.They cannot recover on their own.
C.They cannot adapt to the new environment.
D.They attract many tourists to the United States.
2. What led to the sharp decline in the number of sunflower sea stars?
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C.The rising ocean temperature.
D.The occurrence of a marine disease.
3. What is the relationship between suntlower sea stars and the sea kelp forests?
A.Their common enemies are sea urchins.
B.Sunflower sea stars feed on the sea keep forests.
C.Sunflower sea stars help preserve the sea kelp forests.
D.The sea kelp forests provide habitats for sunflower sea stars.
4. What might Sara Hamilton agree with?
A.More species should be introduced to the ocean.
B.Scientists play the most important role in protecting the ocean.
C.The influence of human activities on the ocean has decreased since 2013.
D.More action should be taken to increase the number of sunflower sea stars.
2023-11-17更新 | 145次组卷
阅读理解-阅读单选(约360词) | 较难 (0.4)

【推荐3】Popping food into the microwave for a couple of minutes may seem harmless, and Europe's stock of these quick-cooking ovens give out as much carbon as nearly 7 million cars, a new study has found, and the problem is growing. With costs falling and kitchen appliances becoming frequently updated, owners are throwing many microwave after an average of eight years. This is pushing sales of new microwaves which are expected to reach 135 million annually in the EU by the end of the decade.

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However,David Reay, professor of carbon management argues that,although microwaves use a great deal of energy, their emissions are minor compared to those from cars. In the UK alone, there are around 30 million cars. These cars emit more than all the emissions from microwaves in the EU. Backing this up, recent data show that passenger cars in the UK emitted 69 million tons of carbon dioxide in 2015. This is 10 times the amount this new microwave oven study estimates for annual emissions for all the microwave ovens in the whole of the EU. Further, the energy used by microwaves is lower than any other form of cooking. Among common kitchen appliances used for cooking, microwaves are the most energy efficient, followed by a stove and finally a standard oven. Thus,rising microwave sales could be seen as a positive thing.

1. What is the finding of the new study?
A.The use of microwaves emits more CO₂ , than people think.
B.CO2 emissions pose a major threat to the environment.
C.The frequent use of microwaves may do harm to our health.
D.Quick-cooking microwave ovens have become more popular.
2. Why are the sales of microwaves expected to rise?
A.They have a shorter life cycle than other appliances.
B.They take less time to cook than other appliances.
C.They are getting much easier to operate.
D.They are becoming more affordable.
3. What recommendation does the study by the University of Manchester make?
A.Cooking food of different varieties.
B.Eating less to cut energy consumption.
C.Improving microwave users' habits.
D.Using microwave ovens less frequently.
4. What does Professor David Reay think of the use of microwaves?
A.It plays a positive role in environmental protection.
B.It makes everyday cooking much more convenient.
C.It will become less popular in the coming decades.
D.It consumes more power than traditional cooking.
2020-11-18更新 | 152次组卷
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