单项选择题

The results of the experiments were ______ and they will have to be done again.

A．comprehensive
B．alternative
C．deliberate
D．ambiguous
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单项选择题
The sky was so clear in fact that the communications crew and recovery team could watch the balloon ______ to its maximum altitude with the naked eye.
A．hike
B．elevate
C．escalate
D．ascend
单项选择题
The storm sweeping over this area now is sure to cause ______ of vegetables in the coming days.
A．prosperity
B．scarcity
C．invalidity
D．solidarity
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