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
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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
According to the speaker, what do people often think about astronomers
A．They spend most of their time looking through telescopes.
B．They are constantly analyzing data.
C．They often live near observatories.
D．They devote a lot of time to theoretical problems.
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