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
How many astronauts died in the Columbia incident
A．Five
B．Six
C．Seven
D．Eight
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