题目：【阅读理解】

    Animals have different ways of protecting themselves against wintertime weather. Some animals grow heavy coats of fur or feathers , while others dig into the ground to find a warm wintertime home.Some animals spend the winter in a deep sleep because by going to sleep they avoid the time of the year when food is scarce and the temperatures are low. Their sleep is known as hibernation .

    There is much about hibernation that puzzles scientists. For example , they are wondering how hibernation came into being. Some scientists have explored the possibility that animals release a chemical that starts them hibernating.

    One thing that scientists are certain about is that animals hibernate only when it is cold. Hibernation is a seasonal practice.

    Some animals that fall into a wintertime sleep are not true hibernators because they spend only a part of the cold season asleep. Bears, for example, can easily be awakened from their winter nap. They are not true hibernators.

    Sometimes it is difficult to determine whether a particular animal is a true hibernator. For example , some mice hibernate , but others do not. The same is true of bats. Some of them hibernate.Other do not.

【问题】Some scientists believe that hibernation is started by       .

A. over-eating

B. calcium deposits

C. a body chemical 

D. a lack of water

【答案】C

【考情点拨】事实细节题。

【应试指导】由第二段最后一句“Some Scientists... animals release a chemical that starts them hibernating.”可知，C项符合题意，故选C。

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