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　　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(反應)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 tones 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 muds．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 be the easiest way to enter the forest, but this still leaves vast areas between the rivers completely unsampled(未取樣)．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：1．B;2．D;3．C;4．C;
解析：

(1)	考查猜測詞義。下文take in around 500 million tones of CO₂ each year即提示。
(2)	考查細節理解。結合第一、二段But how will the Amazon react to future climate change? no one has reached a satisfying answer可知D項為正確答案。
(3)	考查推理判斷。根據最后一段可知到亞馬遜熱帶雨林去收集資料很難，專門的儀器設備是必要的。
(4)	解析：考查主旨大意。標題應具有概括性、針對性和新穎性，所以只有C項最符合。　　文章大意：亞馬遜熱帶雨林，風情萬種，神秘誘人。它是地球上二氧化碳的吸收機。它不但與近代、未來的全球氣候有關聯，還與過去的氣候有關聯。但要走進亞馬遜熱帶雨林去尋找與過去氣候有關的資料，是難上加難。

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