单项选择题

Questions 18～21 are based on a monologue. Which of the following is NOT the duty of the lab instructor

A．Taking care of the students’safety.
B．Grading their lab notebooks.
C．Helping set up the experiments.
D．Giving them lectures on physics.
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单项选择题
How much will the woman pay for the chairs
A．$150.
B．$85.
C．$115.
D．S170.
单项选择题
What time does the man expect the woman to come
A．At sharp 2:00 PM.
B．After 2:00 PM.
C．Anytime in the afternoon.
D．Before 2:00 PM.
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