单项选择题

Questions 19 to 21 are based on the conversation you have just heard.

A．In the middle of the semester.
B．At the beginning of exams.
C．At the end of the school year.
D．In the middle of summer vacation.
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单项选择题
A．Cooking food.B．Boiling water.C．Killing bacteria.D．Generating electricity.
A．Cooking food.
B．Boiling water.
C．Killing bacteria.
D．Generating electricity.
单项选择题
A．At a library.B．In a college bookstore.C．At a news-stand.D．At a department store.
A．At a library.
B．In a college bookstore.
C．At a news-stand.
D．At a department store.
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