应该采取适当的措施限制外国旅游者的数量，努力保护当地环境和历史不受国际旅游业的不利影响。

　　9. An increasing number of experts believe that migrants will exertpositive effects on construction of city. However, this opinion is now beingquestioned by more and more city residents, who complain that the migrants havebrought 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。

　　10. Many city residents complain that it is so few buses in theircity that they have to spend much more time waiting for a bus, which is usuallycrowded 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。

　　11. There is no denying the fact that air pollution is an extremelyserious problem: the city authorities should take strong measures to deal withit.

　　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。

　　12. An investigation shows that female workers tend to have afavorable attitude toward retirement.

　　一项调查显示妇女欢迎退休。

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