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  3. The biggest safety threat airlines face today may not be a terrorist with a gun, but the man with the portable computer in busin

The biggest safety threat airlines face today may not be a terrorist with a gun, but the man with the portable computer in busin

admin2022-06-23  49
问题     The biggest safety threat airlines face 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 may have been caused by electromagnetic interference (电磁干扰). 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 phones.
    RTCA, an organization which advises the aviation (航空) industry, has recommended that all airlines ban 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(电磁场) might affect an aircraft’s computers. Experts know that portable devices emit radiation which affects those wavelengths, which aircraft use for navigation and communication. However, 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 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’s too loud.
It can be inferred from the passage that the author________.
选项 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 flights
答案C
解析 通读全文可知，本文开篇指出如今航空公司面临的最大的安全威胁可能是坐在商务舱中携带手提电脑的人，而许多飞机事故可能是由电磁干扰造成的，并提出虽然电磁干扰的来源没有证实，但专家将其归咎于便携式设备。接下来讲述了航空无线电技术委员会专家在禁止飞行过程中使用电子设备方面的建议，并指出这种建议在实施中的困难及原因。作者在文章中通篇没有提出自己的个人观点，只是在陈述事实和他人的看法。故选C。
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