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

    A. tiring B. necessary C. the worst

    B

    【解析】

    试题分析：句意：我们有必要定期的锻炼。这对于我们的健康有好处。A. tiring 令人厌烦的，B. necessary必要的 C. the worst最糟糕的，所以选出正确答案B。

    考点：考查形容词的用法

    【点评】把形容词的意思与语境结合

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