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    10．A good rest between classes______ recover brain power to its best and make us perform better in class later．（　　）
    A．canB．mustC．needD．shall

    分析 课间好好休息可以使大脑能力恢复到最佳状态并且使我们在后来的课堂上表现得更好．

    解答 答案：A．
    can 表示能力；must必须，应该，一定，准是；need 需要，必要；shall 1．用于第一、第三人称疑问句中，征求对方的意见和向对方请示．2．用于第二、第三人称陈述句中，表示说给对方的命令、决心、警告、允诺或威胁等3．用在条约、规章、法令等文件中表示义务或规定，一般用于第三人称．结合句意"课间好好休息可以使大脑能力恢复到最佳状态并且使我们在后来的课堂上表现得更好．"可知，这里表示能够，所以can符合语境，故选A．

    点评 本题考查情态动词的用法．要理解句意，掌握好各个情态动词的用法．充分利用语境，注意分清各个情态动词适用的句型，得出答案．

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