单项选择题

Since the Great Depression, the United States government has protected farmers from damaging drops in grain prices.

A．slight
B．surprising
C．sudden
D．harmful
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Techniques to employthe energy of the sun are being developed.
A．convert
B．store
C．use
D．receive
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It is out of the questionthat the inspector will come tomorrow.
A．impossible
B．possible
C．probable
D．likely
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