The main idea of this passage is ______. The reason why few airlines want to impose a total ban on their passengers using elect

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问题 The main idea of this passage is ______.
The reason why few airlines want to impose a total ban on their passengers using electronic devices is ______.

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、they have other effective safety measures to fall back on
D、most passengers refuse to take a plane which bans the use of radio and cassette players

答案B

解析 本题问:这一题考核的是对文章全篇内容的正确理解。航空安全问题涉及乘客的生命,如若事实证明使用这种设备是导致空难的原因,那么各航空公司全程禁止使用这种设备是不会遭到乘客的拒绝的,但正是这一点尚未得到证实,所以各航空公司对全程禁止使用这种设备尚犹豫不决。因此本题的答案是B项。
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