【答案】It takes us less time to go to Beijing because the ____ of trains has increased a lot.

It takes us less time to go to Beijing because the ____ of trains has increased a lot.

A. price B. speed C. number D. service

【答案】

B

【解析】

句意：去北京花费的时间少了，因为火车的速度提高了很多。本题考查名词词义辨析。A. price 名词，价格 B. speed名词， 速度 C. number名词，数字，数目 D. 名词， service服务。根据句意选B。