单项选择题

The victims of drunken driving in America over the past decade ______ an incredible 250,000, with three killed every hour of every day on average.

A．take up
B．add up to
C．count for
D．turn out to
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单项选择题
Many people proposed that a national committee be formed to discuss ______ to existing mass transit systems.
A．substitutes
B．measures
C．duplicates
D．alternatives
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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