单项选择题

Questions 16 to 18 are based on the passage you have just heard.

A．Nodding one"s head.
B．Waving one"s hand.
C．Holding up the forefinger
D．Turning the right thumb down.

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单项选择题

单项选择题

Questions 16 to 18 are based on the passage you have just heard. 您的浏览器不支持 audio 元素。