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(yīng)）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 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 aeroplanes .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.
64．The underlined phrase “mopping up” in the second paragraph means      .
A．cleaning up          B．taking in                C．wiping out           D．giving out
65．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.
66．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.
67．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

64---67   BDCC  

64.解析：這是一道猜義題。根據(jù)下文“from the atmosphere”可猜測出mopping up的意思是“吸收”。
65.解析：這是一道細(xì)節(jié)推斷題。根據(jù)短文的最后一句話“So far，only a handful of cores have been drilled that go back to the last ice age and none of them provide information to prove how the Amazon rainforest reacts to climate change.”可推斷出目前還沒有精確的答案。
66.解析：這是一道主旨題。最后一段講述了為了研究Amazon熱帶雨林過去的氣候，科學(xué)家進(jìn)行了采集信息的工作，但是，這是一件十分困難的工作。
67.解析：這是一道主旨題。這篇短文講述了Amazon熱帶雨林的奧秘。
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C
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C
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Almost all green plants on our planet get nitrogen from the soil. “Meat-eating” plants can’t. They live in places where nutrients are hard or almost impossible to get from the soil because of its acidity（酸度）. So they’ve come to rely on getting nitrogen from insects and small animals. In fact, nutrient-rich soil is poisonous to “meat-eating” plants. Never fertilize（施肥）them! But don’t worry, either, if they never seem to catch any insects. They can survive, but they’ll grow very slowly.
64. Venus flytrap      
A. is a small plant which grows in a container. 
B. is a kind of plant which gets hungry easily.
C. can attract, kill, digest and absorb some form of insects.
D. grows 6-8 inches tall  
65. From the passage, we know      .
A. “meat-eating” plants are found on every continent.
B. all green plants get nitrogen from the soil.
C. bug-catching leaves make “meat-eating” different from other plants.
D. some “meat-eating” plants in the rainforest do danger to humans.
66. “Meat-eating” plants grow very slowly,      .
A. so you’d better fertilize them   
B. probably because the source of nitrogen is cut off.
C. simply because they can’t absorb nitrogen from the soil 
D. and then they will die slowly.
67. Which of the following is true?
A. “Meat-eating” plants look and act like other green plants.
B. No insects, no “meat-eating” plants.
C. The reason why Venus flytrap needs flies is that it needs to get nutrient from them.
D. Green plants make sugar at night.
68. What does the underlined word nutrient in paragraph 5 probably mean?
A. 化學(xué)物    B.營養(yǎng)物    C. 肥料      D. 氮?dú)浠衔?/div>

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