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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 interference. The source of this interference remains【B2】______, but increasingly, experts are pointing the blame at portable electronic【B3】______, such as portable computers, radio and cassette players and mobile telephones. RTCA, an organisation which advises the aviation industry, has recommended that all airlines ban such devices from being used during "【B4】______" 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【B5】______airlines. And although some airlines prohibit passengers from using such equipment during take-off and landing, most【B6】______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【B7】______devices emit radiation which affects those wavelengths which aircraft use for navigation and communication. But because they haven’t been able to reproduce these effects in a laboratory, they【B8】______knowing whether the interference might be dangerous or not.
    The fact that aircraft may【B9】______interference raises the risk that terrorists may use radio systems in order to damage【B10】______equipment. As worrying, though, is the passenger who can’t hear the instructions to turn off his radio because the music’s too loud.
【B8】
选项
答案have no way of
解析 分析句子结构可知，主句缺少谓语部分，故可以优先考虑填一动词(短语)。前半句说，专家们无法在实验室里复制这种效果，由此可见，后半句应该是说他们无法确定这种干扰是否具有危险性，故所填词应包含“没有办法……”之意。
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