单项选择题

Scientists are ______ certain that there is a cancer-inhibiting agent in the blood of the shark.

A．dubiously
B．virtually
C．queerly
D．randomly
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单项选择题
Attempts to persuade her stay after she felt insulted were ______.
A．of no avail
B．out of focus
C．queerly
D．in no way
单项选择题
In the last few minutes the conversation has become seemingly ______ as if the discussion were of some minor domestic matte r and not survival itself.
A．crucial
B．central
C．casual
D．causal
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