单项选择题

It can be inferred from the passage that the author______.

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