单项选择题


Questions 9 to 12 are based on the conversation you have just heard.

A．The purpose of laughter.
B．The cause of laughter and its effects.
C．Why and when people laugh.
D．The origin of laughter.
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单项选择题
A．They thought it was the weapon of the gods.B．They thought it was electricity.C．They thought it was firework of the gods.D．They thought it was a mystery.
A．They thought it was the weapon of the gods.
B．They thought it was electricity.
C．They thought it was firework of the gods.
D．They thought it was a mystery.
单项选择题
A．She is not sure whether to get a credit card or not.B．She is not sure how to use a credit card.C．She is not sure which credit card to choose.D．She is not sure how much credit line she needs.
A．She is not sure whether to get a credit card or not.
B．She is not sure how to use a credit card.
C．She is not sure which credit card to choose.
D．She is not sure how much credit line she needs.
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