单项选择题

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

A．convert
B．store
C．use
D．receive
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单项选择题
The lowest temperature that man has ever known was recorded in Antarctica.
A． Right
B． Wrong
C． Not mentioned
单项选择题
Winter temperatures average 85 degrees below zero in Antarctica.
A． Right
B． Wrong
C． Not mentioned
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