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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单项选择题
The space shuttle ______ broke apart and burned up while reentering Earth's atmosphere in 2003.
A．Washington
B．California
C．Explorer
D．Columbia
单项选择题
What is one reason astronomers make long-time exposures
A．To spend less time at their telescopes.
B．To overcome the problem of weak light.
C．To take more photographs.
D．To photograph astronomical objects without using a telescop
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