单项选择题

It can be guessed from the passage that the author ______.

A．is in favor of prohibiting passengers' use of electronic devices completely
B．regards it as unreasonable to exercise a total ban during flight
C．hasn't formed his own opinion on this problem
D．has overestimated the danger of electromagnetic interference
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单项选择题
Why is it difficult to predict the possible effects of electromagnetic fields on an airplane's computers
A．Because it remains a mystery what wavelengths are liable to be interfered with.
B．Because it is extremely dangerous to conduct such research on an airplane.
C．Because research scientists have not been able to produce the same effects in labs.
D．Because experts lack adequate equipment to do such research.
单项选择题
The reason why few airlines want to impose a total ban on their passengers using electronic devices is ______.
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
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