单项选择题


A．in the act of
B．on the point of
C．at the expense of
D．for the sake of
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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.
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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