1、Many experts point out that physical exercise contributes directly to a person's physical fitness.

　　2、Proper measures must be taken to limit the number of foreign tourists and the great efforts should be made to protect local environment and history from the harmful effects of international tourism.

　　3、An increasing number of experts believe that migrants will exert positive effects on construction of city. However, 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.

　　4、Many city residents complain that it is 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.

　　5、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.

　　6、An investigation shows that female workers tend to have a favorable attitude toward retirement.

　　參考譯文：

　　1、許多專家指出體育鍛煉直接有助于身體健康。

　　2、應(yīng)該采取適當(dāng)?shù)拇胧┫拗仆鈬?guó)旅游者的數(shù)量，努力保護(hù)當(dāng)?shù)丨h(huán)境和歷史不受國(guó)際旅游業(yè)的不利影響。

　　3、越來(lái)越多的專家相信移民對(duì)城市的建設(shè)起到積極作用。然而，越來(lái)越多的城市居民卻懷疑這種說(shuō)法，他們抱怨民工給城市帶來(lái)了許多嚴(yán)重的問(wèn)題，像犯罪和賣淫。

　　4、許多市民抱怨城市的公交車太少，以至于他們要花很長(zhǎng)時(shí)間等一輛公交車，而車上可能已滿載乘客。

　　5、無(wú)可否認(rèn)，空氣污染是一個(gè)極其嚴(yán)重的問(wèn)題：城市當(dāng)局應(yīng)該采取有力措施來(lái)解決它。

　　6、一項(xiàng)調(diào)查顯示婦女歡迎退休。