@Tina老师,老师,这道题我明白AB的surely语意不太好。但我不明白CDE里面该怎么选。我觉得c选项,as much technological as 没有DE明确的 technological infrastructure和 economic infrastructure这样比直接。C选项是什么和什么比吖?DE为什么被排除了呢?谢谢老师!
If 500 is the mutiple of 100 that is closest to x and 400 is the multiple of 100 that is closest to y,which multiple of 100 is closest to x+y? (1)x小于500 (2)y小于400