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  3. The biggest safety threat facing today may not be a terrorist with a gun, but the man with the portable computer in business cla

The biggest safety threat facing today may not be a terrorist with a gun, but the man with the portable computer in business cla

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问题     The biggest safety threat facing 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 flight particularly take- off and landing. Some experts have gone further, calling for a total ban during all flights. (76) 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 all aircraft’s computers. (77) 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 (易受捐的) to interference raises the risk that terrorists may use radio systems in order to damage navigation equipment. (78) As worrying, though, is the passenger who can’t hear the instructions to turn off his radio because the music’s too loud.
It can be guessed from the passage that the author ______.
选项 A、is in favor of prohibiting passengers’ use of electronic devices completely
B、regards it as unreasonable to exercise a total ban during flight
C、hasn’t formed his own opinion on this problem
D、has overestimated the danger of electromagnetic interference
答案A
解析 这是一道推导出作者态度的问题。从全篇来看，作者对在飞机上全面禁止使用便携式电子设备态度是肯定的，作者对问题的提出(The biggest safety threat facing air lines today．．．)，列举的数据以及谈论这一问题的口气，都可以看出这一点，因此选项A是答案。
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