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

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

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问题     The biggest safety threat facing airlines today may not be a terrorist with a gun, but the man with a portable computer in business class. In the last 15 years, pilots have reported well over 100 【B1】______that could have been caused by electromagnetic 【B2】______. The source of this interference remains 【B3】______, but increasingly, experts are pointing the blame at portable electronic 【B4】______such as portable computers, radio and cassette players and mobile telephones. RTCA, an organization which advises the aviation industry, has 【B5】______that all airlines ban such devices from being used during "【B6】______" 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 【B7】______airlines. And although some airlines 【B8】______ passengers from using such equipment during take-off and landing, 【B9】______
    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 use for navigation and communication. But because 【B10】______
    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, 【B11】______
【B5】
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答案recommended
解析 空前的has表明，本空应填一过去分词形式的动词。
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