2. Scientists has carried out ______ (研究)on renewable energy sources.

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A ： Hi,Joyce. Why do you walk in a hurry?

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A ：Sounds good ！ Can you tell me what your trouble is?

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A ：Oh,don't worry. 3

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B：Thank you for your advice. Oh,it's time for class. I have to go now. Bye ！

A:Bye!

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(   ) 2. I wonder if the foreign friends______ for Shanghai next week.

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  A student is studying British English. He wants to know 1 he can have a talk with Americans ， and whether they can understand him. Learners of English often ask what the 2 between British English and American English are,and how important they are.

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