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【单选题】

Passage One Questions 11 to 13 are based on the passage you have just heard.

A.
How to give tips.
B.
How to give tips in a restaurant.
C.
How to give tips in a hotel.
D.
How to give tips in a taxi.
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参考解析:
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【单选题】下面有3篇短文,每篇短文后有5道题,每道题后面有4个选项。请仔细阅读短文并根据短文回答其后面的问题,从4个选项中选择1个最佳答案。第一篇 Electronic Mail During the past few years, scientists all over the world have suddenly found themselves productively ...

A.
The quick speed of discoveries may have ill effects on discoveries.
B.
Although it dose not speed up correspondence, it helps to make discoveries.
C.
It quickens mutual communication even if it does not accelerate discoveries.
D.
It shrinks time for communication and accelerates discoveries.