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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  26
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.
Why is it difficult to predict the possible effects of electromagnetic fields on an airplane’s computers?
选项 A、Because it is extremely dangerous to conduct such research on an airplane.
B、Because it remains a mystery as to what wavelengths are liable to be interfered with.
C、Because research scientists have not been able to produce the same effects in labs.
D、Because experts lack adequate equipment to do such research.
答案C
解析 根据第三段第一句“The difficulty is predicting how electromagnetic fields might affect an aircraft’s computers. ”和第三段最后一句“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. ”可知，困难是预测电磁场会如何影响一架飞机上的计算机；因为科学家们不能在实验室内再现这些影响，他们没有办法知道这种干扰是否危险。故选C。
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