单项选择题

Techniques to employ the energy of the sun are being developed.

A．convert
B．store
C．utilize
D．receive
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单项选择题
Are you positive that there's been no mistake
A．rational
B．reasonable
C．certain
D．bound
单项选择题
I didn't ask because I was afraid of looking stupid.
A．foolish
B．boring
C．childish
D．exciting
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