题目

缺词填空 根据短文内容和首字母提示，在下文空格处填入适当的词使短文完整。（每空一词） In China, most students go to school by bike or by bus. If the school is not far, they usually w__1___ to school every day. Few students are l___2__ for class. But things are d__3___ in other countries.    In many Western countries, students live far f__4__ their schools and they have different w__5____ to get to school. Many students go to school by car. If there is an underground system(系统) in the city, they can go by u___6____. In some countries, there are下列物质中，不能用做抗酸药的是 A．氢氧化铝       B碳酸钡      C．碳酸氢钠        D．碳酸镁