单项选择题

Following the prison breakout, the government is to ______.

A．restructure the prison service
B．discipline some prison officers
C．recruit more security staff
D．look into security conditions
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单项选择题
When were the shuttle and telescope moved into a higher orbit
A．Before the telescope was repaired.
B．After the rocket was exploded.
C．When the rocket was within less than a kilometer from the spacecraft.
D．When the experts could look deeper into space than ever befor
单项选择题
According to the news, the plane crashed ______.
A．shortly before it landed
B．minutes after it took off
C．after it cleared the mountain
D．at the foot of the mountain
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