单项选择题

What was NASA accused of on Wednesday'

A．Being too prudent and cautious.
B．Being too hasty to assure safety.
C．Causing the Columbia tragedy.
D．Delaying launch plans.
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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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