单项选择题

The passage is mainly about______.

A．a new regulation for all airlines
B．the defects of electronic devices
C．a possible cause of aircraft crashes
D．effective safety measures for air flight
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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 interferenc
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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