【題目】It is __________ for us to do exercises regularly. It is good for our health.

A. tiring B. necessary C. the worst

【答案】B

【解析】試題分析：句意：我們有必要定期的鍛煉。這對于我們的健康有好處。A. tiring 令人厭煩的，B. necessary必要的 C. the worst最糟糕的，所以選出正確答案B。

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