单项选择题

passage two
Questions 30 to 32 are based on the passage you have just heard.

A．They smile to cover embarrassment.
B．It is an unusual and even suspicious behavior.
C．They smile to show politeness.
D．It is an expression of pleasure.

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单项选择题

单项选择题

passage twoQuestions 30 to 32 are based on the passage you have just heard. 您的浏览器不支持 audio 元素。

passage two
Questions 30 to 32 are based on the passage you have just heard.