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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.

本文是一篇说明文，介绍了手提电脑、移动电话等电子产品在使用时发出的电磁波对电子设备产生影响的情况。

1.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.

[答案与分析]：[C]回答依据为第3段最后一句话。

2.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

[答案与分析]：[C]通读全文不难看出，作者只是在客观地描述人们对电磁波干扰航空设施的认识与瓜，并没有加入自己的评论与看法。

3.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

[答案与分析]：[C]主旨题。问本文的大意是什么。本题主要干扰项是B(电子设施的危害)。B项不恰当，因为文章主要介绍的是一些电子产品对飞机上电子设施的干扰会带来空难危险，而非电子设施的危害。

4.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.

[答案与分析]：[D]回答依据为文章第2句话。could have been表示推测，意为“可能”。

5.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

[答案与分析]：[C]回答依据为文章第2段最后一句。given表示“考虑到，原因在于”。由于许多乘客想在乘飞机时工作，若全面禁止使用那些可能干扰航空电子设备的东西，可能有些乘客就不坐这种飞机了。

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