单项选择题

Questions 18 to 20 are based on the following passage. At the end of the passage, you will be given 15 seconds to answer the questions. Now, listen to the passage.
What does the giant squid symbolize to biologists

A．How sea animals manage to exist.
B．How large sea animals can be.
C．How frightening the squid is.
D．How little we know about the se
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单项选择题
How did bebop band avoid the performance tax
A．They didn’t use singers.
B．They gave free concerts.
C．They performed in small nightclubs.
D．They shortened the length of their performances.
单项选择题
What does the professor imply
A．It is not acceptable to miss class time.
B．The first day of class has been changed.
C．Students are required to take the course.
D．The summer course has been cancele
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