单项选择题

Questions 11 to 18 are based on the conversation you have just heard.

A．They have to buy some umbrellas.
B．They should go back and get the umbrella.
C．They should stop traveling.
D．They can go on traveling.

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It is well known that ______ (把新的科学发现运用到工业生产上，通常可以提高效率).

Questions 11 to 18 are based on the conversation you have just heard. 您的浏览器不支持 audio 元素。