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
Of the 1, 200 million people who call themselves Chinese, ______ a very small number speak what is referred to as standard Chinese.
A．none but
B．but for
C．all but
D．but then
单项选择题
Efforts to reach the injured men have been ______ because of a sudden deterioration in weather conditions.
A．enforced
B．intensified
C．confirmed
D．strengthened
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