单项选择题

Questions 19 to 21 are based on the conversation you have just heard.

A．It doesn’t move at all.
B．It moves much faster than regular lines.
C．It’s next to the regular lines.
D．It’s her favorite.

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Questions 19 to 21 are based on the conversation you have just heard. 您的浏览器不支持 audio 元素。