题目内容

A study shows that walking fast in your old age is a ______ that you will live a long life.
A．signB．markC．symbol D．signal
A
此题为词义辨析题。sign迹象，征兆；mark标记，记号；symbol象征，符号；signal信号。根据题意“老了走的快是长寿的征兆”，因此选A。
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