51. C。孩子发现礼物的吵闹声不会使人害怕或麻烦，只会把人吵醒。

52. A。before引导的时间状语从句为“还未来得及…, 就…”。

53. A。even 用来加强语气。(from www.nmet168.com)

54. B。on the hands and knees 意为“用手和膝盖爬行”，其中on表示方式。

55. D。作者和妻子刚睡不久就被孩子吵醒，这时气球被玩爆了，一声巨响让他们彻底醒来，这爆炸声也预示喜庆的一天开始了。

56. D  事实细节题。根据第2段首句 Nashville is the capital city of the state of Tennessee 可知答案为 D。

57. D  事实细节题。根据第2段第 2、3 句 Here you don’t have to go to the big auditoriums to enjoy the country music. In the open air restaurants or on the streets, you can always hear the beautiful and sweet sounding folk music 可知答案为 D。

58. C  推理判断题。此题可用排除法。根据第3段第 1 句 Shops selling music records and tapes can be found everywhere in Nashville. 可知选项 A 正确；根据第2段末句 The songs they sing are so touching(动人)that, if you listen attentively, you can feel they are singing with their souls rather than with their voices(他们唱的歌如此动人，如果你专心听，你就会觉得他们不是用声音而是用灵魂在唱。)可知 B正确；根据第3段第 2 句 Many records are made by famous singers 可知 C 正确；因此答案为 D。也可根据文章最后一句They often sing in praises of heroism and true love 得到答案。

59. D  主旨大意题。文章首段点明乡村音乐的发源地，然后介绍其流行性，文章末段说明乡村音乐描述的不同的主题。因此可推知本文主要是写乡村音乐，故答案为 D。

60. A  事实细节题。根据第3段 Each story is followed by four pages of short, simple comprehension and vocabulary exercises. 可知答案。

61. A  推理判断题。根据第2段首句 Twenty soft- cover 16-page mini books… 可知共有 20 本书；再根据 Price: $6.00 for each pack of books (including five books)可知：20÷5= 4。故答案为 A。

62. D  推理判断题。根据上题There are 4 packs of the books in this set，及 $6.00 for each pack和$7.00 for each cassettes (all together four cassettes) 可知：4×6+ 4×7= 52。故答案为D。

63. C  推理判断题。根据第2段第 1 句 Nobody knows for sure how people began to use fire 可知选项 C 正确。故答案为 C。

64. C  推理判断题。根据第3段第 2 句 Children sometimes like to play with them. But matches can be very dangerous 可以推断孩子们不可以玩火柴，是因为火柴可能很危险。故答案为 C。

65. D  根据文章倒数第2段中 Fires need oxygen. Without oxygen they die. There is oxygen in the air…This keeps the air away from a fire and kills it 可以推知答案为 D。

66. C  事实细节题。根据文章最后一句 Be careless with fire, and it will burn you 可知答案为C。

67. B  主旨大意题。根据文章首句 Fire can help people in many ways. But it can also be very harmful 可知火有用但也有害，故答案为 B。

68. D  推理判断题。从文章开头两句 I once knew an old man whose bad memory made him famous. John Smith was so forgetful that he sometimes forgot what he was talking about in the middle of a sentence 可以看出，作者认为教授健忘。

69. D  猜测词义。根据第1段中 Since Smith was a professor at a well known university因为史密斯是一所著名的大学的教授，可以推知他的健忘常常是一种不好的事情。所给的四个选项中 satisfaction 意为“使(欲望)满足的事物, 乐事”，fun意为“有趣事物”，amusement 意为“娱乐”，均不符合语境，因此答案为 D。discomfort 意为“使人不舒服(或不安)的事物。”

70. C  推理判断题。根据 Smith forgot the name of the town he was planning to visit. Smith hurried back home to find out where he was going. The professor’s wife was surprised to see him again so soon 可知史密斯忘了要去哪里旅行使他的妻子感到惊讶的；根据最后 I forgot where I left our children 史密斯忘记把小孩留在哪里了。由此可以推测史密斯肯定会很生气。

71. D  事实细节题。根据第5段首句 In the 1800s, the owner of a chocolate factory in England discovered that sugar removed the bitter taste of cacao 可知在十九世纪英国一家巧克力厂的厂主发现糖能把可可豆的苦味除掉。故答案为 D。

72. D  推理判断题。由第一题可知 A 不对；根据第 3段首句 The word “chocolate” comes from a Mayan word. 可知选项 B 不对；根据第2段 2 句 The beans taste so bitter that even the monkeys say “Ugh!” and run away 可知猴子不喜欢，故排除 C；故答案为 D。也可根据第 2 段最后两句 Workers must first dry and then roast the beans. This removes the bitter taste 得出答案。

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