ever, this opinion is now being questioned by more and more city residents, who complain that the migrants have brought many serious problems like crime and prostitution.

　　越来越多的专家相信移民对城市的建设起到积极作用。然而，越来越多的城市居民却怀疑这种说法，他们抱怨民工给城市带来了许多严重的问题，像犯罪和卖淫。

　　7. many city residents complain that there are so few buses in their city that they have to spend much more time waiting for a bus, which is usually crowded with a large number of passengers.

　　许多市民抱怨城市的公交车太少，以至于他们要花很长时间等一辆公交车，而车上可能已满载乘客。

　　8. there is no denying the fact that air pollution is an extremely serious problem: the city authorities should take strong measures to deal with it.

　　无可否认，空气污染是一个极其严重的问题：城市当局应该采取有力措施来解决它。

　　9. a proper part-time job does not occupy students’too much time. in fact, it is unhealthy for them to spend all of time on their study. as an old saying goes: all work and no play makes jack a dull boy.

　　一份适当的业余工作并不会占用学生太多的时间，事实上，把全部的时

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