单项选择题

Questions 29 to 31 are based on the passage you have just heard.

A．Because of the technology progress.
B．Because of the computer revolution.
C．Because of the invention of computer.
D．Because of microwave ovens.

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The phrase go under in the third paragraph most probably means ______ .

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Questions 29 to 31 are based on the passage you have just heard. 您的浏览器不支持 audio 元素。