第一篇 閱讀理解

第一章 篇章常規閱讀理解（4選1）

1

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 “critical” stages of flight, 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 device 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（易受損的）to interference raises the risk that terrorists may use radio systems 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 is 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 able 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

1．【答案】C

【精析】考查主題。主題一般在第一段段首。如果這個題出現在中間的話，一般對應某一段的內容和主題，范圍小一點，比較容易。如果是第一題或最后一題，則對應整篇文章。本文的主題是關于電磁干擾可能影響飛機安全，故選C項。

2．【答案】D

【精析】題干有數字，很容易在文中第一段找到對應的句子。注意could，表示可能，所以選D項：懷疑他們是電磁干擾的結果。

3．【答案】C

【精析】關鍵句在第二段最后一句“given that many passengers want to work during flights”，很多乘客要在飛行期間工作，可以推斷一些航空公司拒絕禁令的原因是：如果他們推行了禁令，也許許多需要在飛機上工作的乘客就不會選擇乘坐飛機了。故選C項。

4．【答案】C

【精析】第三段because后面給出了解釋：因為他們不能在實驗室重現這些影響，所以他們沒辦法知道干擾是不是有危險。所以選C項。A項文中沒有說過，B項和第二句相反，D項沒有提到。

5．【答案】C

【精析】作者沒有很明確的態度，只是做客觀的說明，描寫了很多情況，但沒有表明自己的立場和看法。A．贊成禁令；B．高估危險；C．沒有形成自己的觀點；D．認為禁令無理。