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
What is said about the over 100 aircraft incidents in the past 15 years
A．They may have been caused by the damage to the radio systems.
B．They may have taken place during take - off and landing.
C．They were proved to have been caused by the passengers' portable computers.
D．They were suspected to have resulted from electromagnetic interference.
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.
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