单项选择题

Questions 19 to 22 are based on the conversation you have just heard.

A．To explain the effects of turbidity currents.
B．To explain how winds cause turbidity currents,
C．To remind the student about the next assignment.
D．To remind the student where ocean sediments originate.
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单项选择题
A．He usually talks quietly.B．He usually assigns homework.C．He didn’t teach class today.D．He noticed that the students didn’t do their homework.
A．He usually talks quietly.
B．He usually assigns homework.
C．He didn’t teach class today.
D．He noticed that the students didn’t do their homework.
单项选择题
According to Paragraph 2, all fashion designers should expect to ______.
A) cope with continual fatigue
C) work without remission
B) make a rapid turnover
D) face tough competition
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