单项选择题

Questions 18～21 are based on the following talk of a lab instructor.
What will the students probably do after the talk

A．Leave the room.
B．Hand in their lab notebooks.
C．Go to Professor Kaplan’s office.
D．Work on an experiment.

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Questions 18～21 are based on the following talk of a lab instructor. What will the students probably do after the talk 您的浏览器不支持 audio 元素。