我国早期国家产生的标志是[ ]
A．夏朝的建立
B．商朝的建立
C．西周的建立
D．秦朝的建立
答案：A
可吸入颗粒物（pm10）
用所给动词的适当形式填空。
小题1:Lucy ___________ (go) to the Reading Club twice a week.
小题2:Would you like __________ ( help ) me with my English ?
小题3:_______________ ( not do ) your homework now. Please have a rest.
小题4:It’s time for me _______________ ( answer ) the question.
小题5:What about ______________ ( have ) a rest under the tree.
