题目

 The number of smokers in China ________increased in recent years, and a number of them ________ the youth. A．has; are                                             B．have; are C．is; is　                                              D．are; are 答案：A　句意：最近几年，中国吸烟人的数量增加了，他们中的许多人都是年轻人。the number of“……的数量”，谓语动词用单数；a number of＝many，“许多的”意思，谓语动词用复数，选A。

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