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
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．hash' t formed his own opinion on this problem
D．regards it as unreasonable to exercise a total ban during flight
单项选择题
According to the passage, which of the following sentence is true
A．RTCA has ordered that all airlines ban portable electronic devices from being used during "critical" stages of flight.
B．Individual airlines have the right to decide whether or not to ban portable electronic devices during flight.
C．Almost all airlines enforce a total ban of portable electronic devices during flight.
D．Experts have recommended airlines to prohibit passengers from using electronic devices during take-off and landing.
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