单项选择题

NASA is casting a wider net in the space shuttle investigation as to what caused the spacecraft to swing out of control and______moments before it was to land.

A．disassemble
B．disembark
C．disintegrate
D．disinherit
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单项选择题
The discussion was so prolonged and exhausting that______we had to stop for refreshments.
A．at large
B．at ease
C．at random
D．at intervals
单项选择题
Russian women had to wear protective masks as they walked in Moscow, which was ______by a heavy smog yesterday.
A．shrouded
B．unveiled
C．decayed
D．deprived
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