单项选择题

A．The talks haven’t started yet.
B．The talks haven’t achieved much.
C．The talks have produced a general agreement.
D．The talks broke down and could not go on further.
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单项选择题
A．Small RNA molecules.B．The protein-coding regions.C．DNA and proteins.D．A shuttling messenger.
A．Small RNA molecules.
B．The protein-coding regions.
C．DNA and proteins.
D．A shuttling messenger.
单项选择题
A．A railway porter.B．A taxi driver.C．A bus conductor.D．A postal clerk.
A．A railway porter.
B．A taxi driver.
C．A bus conductor.
D．A postal clerk.
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