参考答案
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. 很多美国人感到沉默很不舒服，他们会侃侃而谈，不让谈话中断，即使只有片刻停止也非所愿，假如你久久一言不发，美国人会设法让你加入谈话。他们也许会问你身体是否舒服，或者是否需要他们帮忙。但是，如果美国人不同意你的意见，他们会默不做声。这样做未必表示他们同意你的意见，常常只表示他们认为继续同你辩论下去不合礼仪。
