Eating better and eating less could be the ______ not only to avoiding cancer but also to living longer.

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问题 Eating better and eating less could be the ______ not only to avoiding cancer but also to living longer.

选项 A、key
B、foundation
C、rule
D、importance

答案A

解析 key to，……的关键，前面可加冠词the。句意为：吃好吃少可能不只是避免癌症的关键，而且是长寿的关键。

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