单项选择题

Questions 22 to 25 are based on the conversation you have just heard.

A．Write their lab reports.
B．Find out Professor Smith’s schedule.
C．Interview some high school students.
D．Finish their chemistry experiment.

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单项选择题

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Lisa Perez was always optimistic during the period of her unemployment.

Questions 22 to 25 are based on the conversation you have just heard. 您的浏览器不支持 audio 元素。