单项选择题

The new graduate was assigned to __________ the quality of food stuff.

A．manipulate
B．supervise
C．ascertain
D．proclaim
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单项选择题
Researches indicate that the moon is so barren that it could not __________ any life.
A．sustain
B．retain
C．adjoin
D．facilitate
单项选择题
A rapid economic development calls for long-time social ________ and unity.
A．solidarity
B．continuity
C．stability
D．discrepancy
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