单项选择题


Passage Two
Questions 29 to 32 are based on the passage you have just heard.

A．45 minutes.
B．60 minutes.
C．90 minutes.
D．40 minutes.
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单项选择题
A．He’s a secretary.B．He’s a novelist.C．He’s a newspaperman.D．He’s a worker.
A．He’s a secretary.
B．He’s a novelist.
C．He’s a newspaperman.
D．He’s a worker.
填空题
While integrase deletes an immune cell’s genetic material and replaces it with its own, it acts like ______ in a word processor.
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