“Melting permafrost can also destroy trees and forests,”Walters said. “When holes in the ground form, trees fall into them and die. This could turn a forest into a swamp (沼泽), and animals which need the forests will have to move elsewhere.”

　　“The melting could cause severe problems.”Walters says, “This could take hundreds of years, but in the end Alaska will look quite different from what it looks like now.”

　　1. Which of the following can be used as the best title of the passage?

　　A. Alaska—A Frozen Land

　　B. Is Alaska Sinking?

　　C. Pollution and Global Warming

　　D. Alaska Is Polluted

　　2. The main reason why permafrost is thawing is that ______.　

　　A. the temperature in Alaska is rising

　　B. people in Alaska don’t take care of permafrost

　　C. too many houses are built on permafrost

　　D. people in Alaska polluted permafrost

　　3. The following are the results of melting permafrost EXCEPT ______.　

　　A. holes form in the ground

　　B. a forest will be turned into a swamp

　　C. some animals have to go elsewhere

　　D. more water will be needed by people and animals

　　4. Which of the following is NOT true according to the passage?

　　A. When permafrost melts, houses will fall down.

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