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 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.