单项选择题

It is obvious from Paragraph 4 that the chief cause leading to the disaster is ______.

A．the leakage of the O rings
B．cold weather
C．structure failures
D．the faulty fuel tank
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单项选择题
Investigation by the special commission revealed that ______.
A．top-level NASA officials made an arbitrary decision for takeoff
B．designers of the spacecraft failed to assess the problem with the booster
C．cold weather caused the O ring to come off the rocket booster
D．the tragedy was caused by at least three factors working together
单项选择题
The word overrule in the first sentence of paragraph 2 means ______.
A．share
B．ignore
C．consider
D．know
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