单项选择题

Turning cultivated land back into forests or pasture is a fundamental way to stem soil ______ and desertification in the long run.

A．erosion
B．depletion
C．violation
D．delusion
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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
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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