新東方：大學(xué)英語四級考試寫作必備佳句(九)

　　18. 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(rèn)為，在發(fā)達(dá)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(yī)療保健的改善使死亡率下降了。

　　19. There is no doubt that the increase in demand caused the rise in prices.

　　毫無疑問，需求的增長導(dǎo)致了價格的上漲。

　　20. 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(xiàn)代交通工具使這種流動相對容易)引發(fā)的種種問題也會對社會造成新的壓力。(超循環(huán)背誦大表)