单项选择题

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

A．He should do the experiment later.
B．He must be extremely careful.
C．She is willing to do the experiment for him.
D．She’s sure he is not right.

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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。