单项选择题

Questions 22 to 25 are based on the conversation you have just heard.

A．She is a travel agent.
B．She is a (real) estate agent.
C．She sells cars.
D．She sells hotels.

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According to Mary Czerwinski’s research, computer users are constantly shifting from window to window, pausing ______ at each one.

单项选择题

Questions 22 to 25 are based on the conversation you have just heard. 您的浏览器不支持 audio 元素。