Rivers tend to be 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 forest reacts to climate change.

　　25. How do scientists study the past climate change?

　　A. By predicting the climate change in the future.

　　B. By drilling down deep into land sediments.

　　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

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