在职攻硕英语考试

【单选题】 Few airlines want to impose a total ban on their passengers using electronic devices because______.
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．most passengers refuse to take a plane which bans the use of radio and cassette players
D．they have other effective safety measures to fall back on

网考网参考答案：B
网考网解析：
依据文章第一段第四行可推断。 查看试题解析出处>>