单项选择题

How many astronauts died in the Columbia incident

A．Five
B．Six
C．Seven
D．Eight
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单项选择题
NASA had planed to launch its space shuttle ______ in September.
A．Discover
B．Atlanta
C．Columbia
D．Atlantis
单项选择题
What did most European scholars believe before 17th century about-the size of the universe
A．That it can't be measured.
B．That it doesn't change.
C．That it's getting smaller.
D．That it's rapidly increasin
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