<正> 1.In some countries children usually go_bikes. A.to school on B.to the school on C.to school by D.to the school by 问:这道题为什么选A,而不选C呢? 答:go to school(去上学)是固定说法,school前不加冠词the,所以B、D显然都不对。那么为什么选A,而不选C呢? by作“骑(或乘车)”讲时,其后只能跟名词单数,不能跟名词复数。如:by bike,by plane,by bus。但题中bikes是复数,所以不能选C。 on作“骑(乘车)”讲时其后既可跟名词单数,也可跟名词复数,