题目内容
（请给出正确答案）
The researchers have tested their spray in the lungs.
A．Right
B．Wrong
C．Not mentioned
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A．Y
B．N
C．NG
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A．started
B．finished
C．changed
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A．started
B．finished
C．changed
D．made
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B．finished
C．changed
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According to the professor, what have the researchers agreed on？
A．The rocks cannot move after ice storms.
B．The rocks do not move at night.
C．The rocks never move in circles.
D．The rocks are not moved by people.
Researchers have discovered that dolphins are able to mimic human speech.
A．import
B．imitate
C．impair
D．humor
Researchers have studied the connection between aspirin and heart disease for _______.
A．more than a century
B．more than ten years
C．more than one year
D．a few years
Researchers have established the() between smoking and cancer.
A link
B chain
C join
D economy
