专升本英语（阅读理解）模拟试卷26
阅读理解
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 past 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 device 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 \\
1.The passage is mainly about______.(C)
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
解析：考查主题。主题一般在第一段段首。如果这个题出现在中间的话，一般对应某一段的内容和主题，范围小一点，比较容易。如果是第一题或最后一题，则对应整篇文章。本文的主题是关于电磁干扰可能影响飞机安全，故选C。
2.What is said about the over 100 aircraft incidents in the past 15 years?(D)
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.
解析：题干有数字，很容易在文中第一段找到对应的句子。注意could，表示可能，所以选D：怀疑他们是电磁干扰的结果。
3.Few airlines want to impose a total ban on their passengers using electronic devices because ______.(C)
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
解析：关键句在第二段最后一句，given thatmany passengers want to work during flights． 很多乘客要在飞行期间工作，可以推断一些航空公司拒绝禁令的原因是：如果他们推行了禁令，也许许多需要在飞机上工作的乘客就不会选择乘坐飞机了。故选C。
4.Why is it difficult to predict the possible effects of electromagnetic fields on an airplane’ s computers?(C)
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 able to produce the same effects in labs.
D. Because experts lack adequate equipment to do such research.
解析：第三段because后面给出了解释：因为他们不能在实验室重现这些影响，所以他们没办法知道干扰是不是有危险。所以选C。A文中没有说过，B和第二句相反，D没有提到。
5.It can be inferred from the passage that the author______.(C)
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
解析：作者没有很明确的态度，只是做客观的说明，描写了很多情况，但没有表明自己的立场和看法。A赞成禁令；B高估危险；C没有形成自己的观点；D认为禁令无理。
Under proper conditions, sound waves will be reflected from a hillside or other such obstruction. Sound travels at the rate of about one-fifth of a mile per second. If the hill is eleven hundred feet away, it takes two seconds for the sound to travel to the hill and back. Thus, by timing the interval between a sound and its reflection (the echo), you can estimate the distance to an
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