单项选择题

He raised his eyebrows and stuck his head forward and ______ it in a single nod, a gesture boys used then for OK when they were pleased.

A．jerked
B．twisted
C．shrugged
D．tugged
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单项选择题
The results are hardly ______ ; he cannot believe they are accurate.
A．crucial
B．critical
C．credible
D．contrary
单项选择题
______ that the demand for power continues to rise at the current rate, it will not be long before traditional sources become inadequate.
A．Concerning
B．Regarding
C．Ascertaining
D．Assuming
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