单项选择题

A．Save time by using a computer.
B．Buy her own computer.
C．Borrow Martha’’s computer.
D．Stay home and complete her paper.
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单项选择题
A．All airlines have enforced a total ban on electronic devices during flights.B．Portable computers are confirmed as the greatest cause of aircraft crashes.C．It is difficult to predict how electromagnetic fields might affect an aircraft’’s computers.D．Mobile phones are as dangerous as portable computers on an airplane.
A．All airlines have enforced a total ban on electronic devices during flights.
B．Portable computers are confirmed as the greatest cause of aircraft crashes.
C．It is difficult to predict how electromagnetic fields might affect an aircraft’’s computers.
D．Mobile phones are as dangerous as portable computers on an airplane.
单项选择题
A．Brush your teeth right before you go to bed in the evening.B．Have as few of your teeth pulled out as possible.C．Have your teeth X-rayed at regular intervals.D．Clean your teeth shortly after eating.
A．Brush your teeth right before you go to bed in the evening.
B．Have as few of your teeth pulled out as possible.
C．Have your teeth X-rayed at regular intervals.
D．Clean your teeth shortly after eating.
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