单项选择题

What has happened in Venezuela, according to the news

A．Serious car accident.
B．Plane crash.
C．Collision of trains.
D．Missing of a plan
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单项选择题
The shuttle flies to the earth at ______ an hour after reentering the atmosphere.
A．7,000
B．17,000
C．27,000
D．70,000
单项选择题
Why has the return of Discovery been delayed for 24 hours
A．Because of mechanical faults aboard.
B．Because of unfinished work.
C．Because of the bad weather at the landing site.
D．Because of unknown reason.
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