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

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

admin2014-03-21  29
问题      The biggest safety threat facing airlines 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 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 ail flights. Currently, rules on using these devices are left up to individual airiness. 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 an aircraft’ s computers. Experts know that portable devices emit radiation which affects those wavelengths which aircraft’ s 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 aircrafts 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.
According to the passage, which of the following sentence is true?
选项 A、RTCA has ordered that all airlines ban portable electronic devices from being used during "critical" stages of flight.
B、Individual airlines have the right to decide whether or not to ban portable electronic devices during flight.
C、Almost all airlines enforce a total ban of portable electronic devices during flight.
D、Experts have recommended airlines to prohibit passengers from using electronic devices during take-off and landing.
答案B
解析 细节题。A项中，DTCA只是一个咨询机构，只有建议权，没有命令权。C项中，文章表述的恰恰相反，大部分的航空公司没有实行禁令。至于D项，文章没有明确提到。B项的依据主要来自于"rules on using these devices are left up to individual airiness"句。
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