单项选择题

Scientists are expected to carry out thoroughgoing studies to back up claim's made concerning new drugs.

A．support
B．elevate
C．investigate
D．challenge
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单项选择题
The daring young man rode through the Indian village trying to find his long-lost sister.
A．bold
B．cowardly
C．persistent
D．caring
单项选择题
We can't rule out the possibility that he was murdered by his wife.
A．foresee
B．run out
C．exclude
D．foretell
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