单项选择题

The passage wants to ______.

A．tell patients what they can do and what they can't
B．tell people when they can visit patients and when they can't
C．give patients guidelines on how to treat their illnesses
D．give people ideas on how to treat their illnesses

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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

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