8. it is generally believed that the chief reason for the increase in population in developed countries is not so much the rise in birth rates as the decline in death rates as a result of the improvement in medical care.

　　普遍認為，在發達國家人口增長的主要原因與其說是出生率的上升，還不如說是由于醫療保健的改善使死亡率下降了。

　　9. there is no doubt that the increase in demand caused the rise in prices.

　　毫無疑問，需求的增長導致了價格的上漲。

　　10. additional social stresses may also occur because of the population explosion or problems arising from mass migration movements-themselves made relatively easy nowadays by modern means of transport.

　　由于人口的猛增或大量人口流動(現代交通工具使這種流動相對容易)引發的種種問題也會對社會造成新的壓力。

　　11. with the opening and reform policy being carried out, thousands upon thousands of foreign visitors are crowding into our country. they are eager to see this old mysterious land with a splendid culture of more than 5,000years.

　　隨著改革開放政策的貫徹執行，數以萬計的外國游人涌入中國。他們渴望參觀這個有著5000多年燦爛文化的神秘古國。

　　12. tourism brings china a lot of benefits. first, it enables the chinese people to know more about the outside world and promotes friendship and understanding. second, it is financially beneficial to china, which needs more foreign currencies for its modernization program.

　　旅游業給中國帶來許多好處。首先，它使中國人了解外界，并有助于促進友誼和理解。其次，在經濟上也有利于我國，因為中國現代化建設需要大量的外匯。

　　13 tourism, however, gives rise to a number of problems. for instance, it becomes a burden to inefficient transportation system.

　　旅游業也引起許多問題。例如，它增加了我國本來效率不高的運輸系統的負擔。

　　14. besides, the living standard of the average chinese is still not high enough to be able to afford the many different sorts of expensed during long distance travels.

　　此外，中國人民的生活水平還沒有高到足以使普通中國人有錢支付長途旅行的各種開支。

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