题目内容
（请给出正确答案）
The scientists have absolute freedom as to what research they think is the best to______
A．engage
B．devote
C．seek
D．pursue
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Even talented scientists have no way to precisely forecast the future. (英译汉)
Scientists have known the reason that people grow old.
A．Right
B．Wrong
C．Not mentioned
Scientists have made a __________ in their combat against the AIDS.
A．breakup
B．breakdown
C．breakthrough
D．breakout
A.Not until…have
B.Until…did
C.Not until…do
D.Until…have
A．studying
B．researching
C．investigating
D．inspecting
The article does not say whether the scientists' experiments with dogs have ______.
A．benefited animals other than dogs
B．served man
C．helped other dogs
D．contributed to medical knowledge
A．is
B．was
C．being
D．to be
Scientists have found that listening to "sad" music can make one feel warmer.
A．Y
B．N
C．NG
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