Walk through the Amazon rainforest today and you will find it is steamy, warm, damp and thick. But if you had been around 15, 000 years ago, during the last ice age, would it have been the same? For more than 30 years, scientists have been arguing about how rainforests like the Amazon might have reacted (反应) to the cold, dry climates of the ice ages, but until now, no one has reached a satisfying answer. Rainforests like the Amazon are important for mopping up CO2 from the atmosphere and helping to slow global warming. Currently the trees in the Amazon take in around 500 million tons of CO2 each year: equal to the total amount of CO2 giving off in the UK each year. But how will the Amazon react to future climate change? If it gets drier, will it still survive and continue to draw down CO2? Scientists hope that they will be able to learn in advance how the rainforest will manage in the future by understanding how rainforests reacted to climate change in the past. Unfortunately, getting into the Amazon rainforest and collecting information are very difficult. To study past climate, scientists need to look at fossilized pollen, kept in lake mud . Going back to the last ice age means drilling deep down into lake sediments(沉淀物) which requires specialized equipment and heavy machinery. There are very few roads and paths, or places to land helicopters and aero planes. Rivers tend to the easiest way to enter the forest, but this still leaves vast areas between the rivers completely unsampled (未取样). So far, only a handful of cores have been drilled that go back to the last ice age and none of them provide enough information to prove how the Amazon rainforest reacts to climate change.
1. The underlined phrase “mopping up” in the second paragraph means “______”.
A. cleaning up B. taking in C. wiping out D. giving out
2. How will the Amazon rainforest react to future climate change?
A. It'll get drier and continue to remove CO2. B. It'll remain steamy, warm, damp and thick.
C. It'll get warmer and then colder and drier. D. There is no exact answer up to present.
3. What's the main idea of the last paragraph?
A. It's important to drill deep down into lake sediments to collect information.
B. It's impossible to prove how climate changes in the Amazon rainforest.
C. It's hard to collect information for studies of the past climate in the Amazon rainforest.
D. It's necessary to have specialized equipment and machinery to study the past climate.
4. The best title for this passage may probably be _____.
A. Studies of the Amazon B. Climates of the Amazon
C. Secrets of the Rainforests D. Changes of the Rainforests
【答案与解析】本文主要介绍了热带雨林对气候的影响。
B。词义猜测题。根据第二段中的 helping to slow global warming，同时结合化学知识可推知 mopping up 的意思是“吸入”mso-bidi-font-family: 'Times New Roman'">。另外，文章中的…currently the trees in Amazon take in around 500 million tones of CO2 each year 也暗示 mop up 和 take in 的意思相同。
D。事实细节题。根据文章第2段的内容(尤其是最后一句话)尤其是最后一句话可推知此题最佳答案为D。
C。主旨大意题。根据文章最后一段中的So far, only a handful of cores have been drilled 可知，资料收集不是很容易。
C。主旨大意题。文章主要讲的是亚马孙热带雨林难以预料的变化，所以选C为佳。为佳。
。