单项选择题

Passage One Questions 11 to 13 are based on the passage you have just heard.

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
Since we have no objection to this item, let's pass on to the next on the______.
A．alternation
B．agenda
C．accord
D．algebra
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