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,更是长寿的关键。
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