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

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

admin2019-05-26  22
问题     The biggest safety threat facing airlines today may not be a man with a gun, but the man with the portable computer in business class. In the last 15 years, pilots have reposed well over 100 incidents that could have been caused by electromagnetic interference(电磁波干扰). The source of this interference remains a mystery, but increasingly, experts are pointing the blame at potable electronic devices such as portable computers, radio and mobile telephones.
    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. 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 predicting how electromagnetic fields might affect an aircraft’ s computers. Experts know that portable devices give out radiation that affects navigation and communication of aircraft. 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.
Few airlines want to impose a total ban on their passengers using electronic devices because
选项 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
D、they have other effective safety measures to fall back on
答案C
解析 第二段最后一句“Although some airlines prohibit…want to work during flights．”指出大部分航空公司不愿意实行一个全面禁令，原因是很多乘客想在飞行过程中工作。由此可推出，航空公司考虑到这样的禁令可能导致乘客不愿乘坐他们的飞机，故不推行这样的禁令。
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