Part Ⅴ Translation (20%)
(76) But brief replies do not mean Americans are impolite of unfriendly to some extent.
(77) If people praise them or thank them in an especially polite way, they may become uncomfortable and not know what to say in reply .
(78) The advantages and disadvantages of a large population have long been a subject of discussion among economists (经济学家).
(79) When the pressure of population on housing declines, prices also decline and the building industry is weakened.
(80) It wasn’t until the twentieth century that women’s umbrellas began to be made in a variety of colors.
(81) 她的工作是照看这些老人。
(82) 学生应该在上课之前完成家庭作业。
(83) 这些老人养成了每天早上锻炼的习惯。
(84) 如果到处都太拥挤，旅行会令人很不愉快。
(85) 我不知道你那奇怪的想法来自何处。
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