题目内容

The weather changes very often in Britain because______．

A. the country has many big forests
B. the country is a very large dryland
C. the country is a small island
D. the country's sky is not clean

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Why are some scientists interested in studying aging problem？

A. They want to increase the general ability of our bodies．
B. They may be able to find a better way of our life．
C. If they can pin down the biochemical process that makes us age,there will be hope for extending the length of life．
D. They want to find out ifthere is a link between how efficiently a cell could repair itself and how long a creature lives．

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