单项选择题

Questions 11 to 18 are based on the conversation you have just heard.

A．He’s a secretary.
B．He’s a novelist.
C．He’s a newspaperman.
D．He’s a worker.

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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.

单项选择题

Questions 11 to 18 are based on the conversation you have just heard. 您的浏览器不支持 audio 元素。