问题补充:
China’s population is expected to increase to about 1.5 billion in 2040, it will start to decline slowly.
A. where
B. which
C. after which
D. on which
答案:
A. where
B. which
(答案→)C. after which
D. on which
解析:情景对话句意为:中国的人口有望在增长到15亿左右。此后,人口增长速度将会减慢
定语从句可分为限制性和非限制性定语从句。此题显然属于非限制性定语从句,关系词的选择就成为关键。介词+which或whom=关系副词从功能上将,A,C,D归为一类,B为第二类。又从句中缺状语,故排除B选项。讲第一类细分,C和D在功能上一致,相当于when,不过意义上有区别。B选项充当地点状语。根据句意,可排除B。C和D的区别在介词上,确定介词的方式就是和前面的名词(现行词)进行搭配。以此题为例,after which 在2040之后,on which 在2040这一年,显然C符合题意