题目内容
9.Too many sweets are bad for teenagers'teeth.(tooth)分析 太多的甜食对青少年的牙齿有害.
解答 答案:teeth;根据句中的teenagers'可知该用tooth的复数形式teeth;故填teeth.
点评 根据给出的句子信息判断该词的适当形式,从而作出正确解答.
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