C. By analyzing fossilized pollen in lake mud.
D. By taking samples from rivers in the Amazon.
26. Why is it difficult to collect information about the past climate change?
A. Because scientists can't find proper equipment and machinery.
B. Because it is very difficult to obtain complete samples.
C. Because helicopters and aeroplanes have no place to land.
D. Because none of the cores provide any information.
27. Where is the passage most probably taken from?
A. A medical journal.
B. A news report
C. A travel brochure.
D. A science magazine.
28. The best title for the text may be
.
A. Secrets of the Rainforest
B. Climates of the Amazon
C. The History of the Rainforest
D. Changes of the Rainforest
【答案】
25C
26B
27D
28A
【解析】
26. B 推理判断题。根据第三段三、四、五句Going back to the last ice age means drilling 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.
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