单项选择题

A．Small RNA molecules.
B．The protein-coding regions.
C．DNA and proteins.
D．A shuttling messenger.
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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.
单项选择题
The______ photograph is wonderful, which arouses great interests among the students.
A．aerial
B．aerospace
C．adverse
D．survival
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