单项选择题

Questions 14～17 are based on the following dialogue between two lovers. What are they doing at the airport

A．They are traveling together.
B．They are having a walk.
C．They are saying goodbye to each other.
D．They are chatting.
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单项选择题
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.
单项选择题
What is the woman doing
A．She is serving her guests.
B．She is singing songs.
C．She is working hard.
D．She is looking at the city.
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