完型1.Some cities are crowded.They have bus or train s____ to help people travel through them.

问题描述:

完型1.Some cities are crowded.They have bus or train s____ to help people travel through them.

Some cities are crowded.They have bus or train stations to help people travel through them.
意思:
有的城市人很多。它们都有公共汽车或者火车站让人们坐。

services

Some cities are crowded.They have bus or train stations to help people travel through them.