同等学力英语考试阅读理解练习题（28）

　　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 that 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.

　　RTCA, an organization which advises the aviation ( 航空 ) industry, has recommended that all airlines ban ( 禁止 ) such devices from being used during "critical" stages of light, particularly take off and landing. Some experts have gone further, calling for a total ban during all flights. Currently, rules on using these devices are left up to individual airlines. And although some airlines prohibit passengers from using such equipment during take off and landing, most are reluctant to enforce a total ban, given that many passengers want to work during flights.

　　The difficulty is predicting how electromagnetic fields might affect an aircraft's 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 knowing whether the interference might be dangerous or not.

　　The fact that aircraft may be vulnerable ( 易受损的 ) to interference raises the risk that terrorists may use radio system in order to damage navigation equipment. As worrying, though, is the passenger who can't hear the instructions to turn off his radio because the music's too loud.

　　1 .The passage is mainly about_______.

　　A) a new regulation for all airlines B) the defects of electronic devices

　　C) a possible cause of aircraft crashes D) effective safety measures for air flight

　　2 .What is said about the over 100 aircraft incidents in the past 15 years?

　　A) They may have been caused by the damage to the radio systems.

　　B) They may have taken place during take off and landing.

　　C) They were proved to have been caused by the passengers' portable computers.

　　D) They were suspected to have resulted from electromagnetic interference.

　　3 .Few airlines want to impose a total ban on their passengers using electronic devices because_______.

　　A) they don't believe there is such a danger as radio interference

　　B) the harmful effect of electromagnetic interference is yet to be proved

　　C) most passengers refuse to take a plane which bans the use of radio and cassette players

　　D) they have other effective safety measures to fall back on

　　4 .Why is it difficult to predict the possible effects of electromagnetic fields on an airplane's computers?

　　A) Because it is extremely dangerous to conduct such research on an airplane.

　　B) Because it remains a mystery what wavelengths are liable to be interfered with.

　　C) Because research scientists have not been to produce the same effects in labs.

　　D) Because experts lack adequate equipment to do such research.

　　5 .It can be inferred from the passage that the author_______.

　　A) is in favor of prohibiting passengers' use of electronic devices completely

　　B) has overestimated the danger of electromagnetic interference

　　C) hasn't formed his own opinion on this problem

　　D) regards it as unreasonable to exercise a total ban during flight

　　答案： 1.C 2.D 3.B 4.C 5.A

    2015年新阳光同等学力辅导班已于9月开班，经过一段时间的学习，很多学员反映复习效果良好。为了服务更多的学员，帮错过前期报班的学，现已开通辅导二班，立志于继续携手北大、人大等名校师资集中讲给考生传授授考试重点、难点，帮助学员短时间内获得提升，并最终顺利通过考试。详情请点击：/zhuanti/tdxlkb.html

    更多同等学力英语考试的干货学习方法技巧请浏览同等学力英语单科频道，关于2015同等学力申硕院校招生开班的详细信息可以联系我们的在线老师获取。