单项选择题

Others viewed the findings with ______, noting that a cause-and-effect relationship between passive smoking and cancer remains to be shown.

A．caution
B．passion
C．optimism
D．deliberation
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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
单项选择题
The results are hardly ______ ; he cannot believe they are accurate.
A．crucial
B．critical
C．credible
D．contrary
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