參考答案

　　I. 1.A 2.C 3.C 4.D 5.B 6.B 7.A 8.D 9.D 10.B

　　II. 11.B 12.D 13.A 14.A 15.B 16.B 17.C 18.D 19.C 20.B

　　III. 21.B 22.C 23.D 24.A 25.A 26.C 27.B 28.D 29.B 30.A 31.A 32.C 33.C 34.B 35.D

　　IV. 36.widespread 37.trade 38.0ccupy 39.urban 40.average 41.quantity

　　42.decorate 43.precise 44.budget 45.topic 46.stimulate 47.honest

　　48.switch 49.famous 50.independent 51.mix 52.persuade 53.pipe

　　54.praise 55.third

　　V. 56.carefully 57.are priced 58.facing 59.was based 60.had taken 61.feet

　　62.transmitted/ to be transmitted 63.would have arrived 64.being treated 65.earliest

　　VI. 66.It was lightning that caused the forest fire last year.

　　67. Air pollution endangers people's health directly.

　　68. The experts have been discussing this problem all the morning.

　　69. Many Americans complain that the government spends too much money on those programs.

　　70. Curiosity and imagination are often viewed as the key to success.

　　VII. 很多美國(guó)人感到沉默很不舒服，他們會(huì)侃侃而談，不讓談話中斷，即使只有片刻停止也非所愿，假如你久久一言不發(fā)，美國(guó)人會(huì)設(shè)法讓你加入談話。他們也許會(huì)問你身體是否舒服，或者是否需要他們幫忙。但是，如果美國(guó)人不同意你的意見，他們會(huì)默不做聲。這樣做未必表示他們同意你的意見，常常只表示他們認(rèn)為繼續(xù)同你辯論下去不合禮儀。