单项选择题

Questions 11 to 18 are based on the conversation you have just heard.

A．Professors are responsible for the cleaning work.
B．Professors are responsible for reminding students to behave well.
C．It is unusual that the lecture hall is mess.
D．Students are thoughtless
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单项选择题
A．He should send the package third class.B．He should send the package first class.C．He can save his money.D．The first class mail is expensive.
A．He should send the package third class.
B．He should send the package first class.
C．He can save his money.
D．The first class mail is expensive.
单项选择题
A．Findings of two studiesB．Understanding of women and their sense of smellC．Smell and geneD．Smell experiments
A．Findings of two studies
B．Understanding of women and their sense of smell
C．Smell and gene
D．Smell experiments
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