1、大学英语四级（听力）练习试卷 21及答案与解析 （ A） A terrorist with a gun. （ B） A passenger with a portable computer. （ C） A tired pilot. （ D） A smaller airplane. （ A） Portable computers. （ B） Radio. （ C） Mobile telephones. （ D） The source remains unconfirmed. （ A） Because it is extremely dangerous to conduct such resear
2、ch on an airplane. （ B） Because it remains a mystery what wavelengths are liable to be interfered with. （ C） Because scientists have not been able to produce the same effects in labs. （ D） Because experts lack adequate equipment to do such research. （ A） All airlines have enforced a total ban on ele
3、ctronic devices during flights. （ B） Portable computers are confirmed as the greatest cause of aircraft crashes. （ C） It is difficult to predict how electromagnetic fields might affect an aircrafts computers. （ D） Mobile phones are as dangerous as portable computers on an airplane. Section C Directi
4、ons: In this section, you will hear a passage three times. When the passage is read for the first time, you should listen carefully for its general idea. When the passage is read for the second time, you are required to fill in the blanks numbered from 36 to 43 with the exact words you have just hea
5、rd. For blanks numbered from 44 to 46 you are required to fill in the missing information. For these blanks, you can either use the exact words you have just heard or write down the 4 For many women nowadays, choosing whether to work or not to work outside the home is a luxury: They must work to【 B1
6、】 _. Others face a hard decision. Perhaps the easiest choice has to do with【 B2】 _. One husband said, “Marge and I decided after careful consideration that for her to go back to work at this moment was an extravagance we couldnt【 B3】 _. “With two preschool children, it soon became clear in their fig
7、uring that with babysitters,【 B4】 _, and increased taxes, rather than having more money by having a working mother, they might【 B5】_end up with less. Economic factors are usually the first to be【 B6】 _, but they are not the most important. The most important aspects of the decision have to do with t
8、he【 B7】_needs of each member of the family. It is in this area that husbands and wives find themselves having to face many confusing and【 B8】 _feelings. There are many women who find that homemaking is boring or who feel imprisoned if they have to stay home with a young child or several children.【 B
9、9】 _. From my own experience, I would like to suggest that sometimes the decision to go back to work is made in too much haste.【 B10】 _. I wasnt mature enough to see how much I could have gained at home. I regret my impatience to get on with my career.【 B11】 _. 5 【 B1】 6 【 B2】 7 【 B3】 8 【 B4】 9 【 B5
10、】 10 【 B6】 11 【 B7】 12 【 B8】 13 【 B9】 14 【 B10】 15 【 B11】 大学英语四级（听力）练习试卷 21答案与解析 1 【听力原文】 The biggest safety threat facing airlines today may not be a terrorist with a gun, but the man with the portable computer in business class. In the last 15 years, pilots have reported well over 100 incidents th
11、at could have been caused by electromagnetic interference. The source of this interference remains unconfirmed, but increasingly, experts are pointing the blame at portable electronic devices such as portable computers, radio and cassette players and mobile telephones. Radio Technical Commission for
12、 Aeronautics, or RTCA, an organization which advises the aviation industry, has recommended that all airlines ban such devices from being used during “critical“ stages of a flight, particularly takeoff and landing. Some experts have gone further, calling for a total ban during all flights. Currently
13、, rules on using these devices are left up to individual airlines. And although some airlines prohibit passengers from using such equipment during takeoff and landing, most are reluctant to enforce a total ban, given that many passengers want to work during flights. The difficulty is predicting how
14、electromagnetic fields might affect an aircrafts computers. Experts know that portable devices emit radiation which affects those wavelengths which aircraft use for navigation and communication. But, because they have not been able to reproduce these effects in a laboratory, they have no way of know
15、ing whether the interference might be dangerous or not. 1 【正确答案】 B 【知识模块】 听力 2 【正确答案】 D 【知识模块】 听力 3 【正确答案】 C 【知识模块】 听力 4 【正确答案】 C 【知识模块】 听力 Section C Directions: In this section, you will hear a passage three times. When the passage is read for the first time, you should listen carefully for its gen
16、eral idea. When the passage is read for the second time, you are required to fill in the blanks numbered from 36 to 43 with the exact words you have just heard. For blanks numbered from 44 to 46 you are required to fill in the missing information. For these blanks, you can either use the exact words
17、 you have just heard or write down the 4 【听力原文】 For many women nowadays, choosing whether to work or not to work outside the home is a luxury: They must work to (26) survive. Others face a hard decision. Perhaps the easiest choice has to do with (27) economics. One husband said, “Marge and I decided
18、 after careful consideration that for her to go back to work at this moment was an extravagance we couldnt (28) afford.“ With two preschool children, it soon became clear in their figuring that with babysitters, (29) transportation, and increased taxes, rather than having more money by having a work
19、ing mother, they might (30) actually end up with less. Economic factors are usually the first to be (31) considered, but they are not the most important. The most important aspects of the decision have to do with the (32) emotional needs of each member of the family. It is in this area that husbands
20、 and wives find themselves having to face many confusing and (33) conflicting feelings. There are many women who find that homemaking is boring or who feel imprisoned if they have to stay home with a young child or several children. (34) On the other hand, there are women who think that homemaking g
21、ives them the deepest satisfaction. From my own experience, I would like to suggest that sometimes the decision to go back to work is made in too much haste. (35) There are few decisions that I now regret more. I wasnt mature enough to see how much I could have gained at home. I regret my impatience
22、 to get on with my career. (36) I wish I had allowed myself the luxury of watching the world through my little girls eyes. 【知识模块】 听力 5 【正确答案】 survive 【知识模块】 听力 6 【正确答案】 economics 【知识模块】 听力 7 【正确答案】 afford 【知识模块】 听力 8 【正确答案】 transportation 【知识模块】 听力 9 【正确答案】 actually 【知识模块】 听力 10 【正确答案】 considered 【知
23、识模块】 听力 11 【正确答案】 emotional 【知识模块】 听力 12 【正确答案】 conflicting 【知识模块】 听力 13 【正确答案】 On the other hand, there are women who think that homemaking gives them the deepest satisfaction 【知识模 块】 听力 14 【正确答案】 There are few decisions that I now regret more 【知识模块】 听力 15 【正确答案】 I wish I had allowed myself the luxury of watching the world through my little girls eyes 【知识模块】 听力
