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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  30
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.
The passage is mainly about________.
选项 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 flight
答案C
解析 通读全文可知，第一段第一句“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. ”引出主题：如今航空公司面临的最大的安全威胁可能不是携枪的恐怖分子，而是坐在商务舱中携带手提电脑的人。接下来文章围绕电子设备产生的电磁干扰问题进行了论述。由此可推知，本文主要讲述的是飞机失事的一个可能原因。故选C。
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