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  • 1. 用方框内所给词的适当形式填空。

    chemistry    coal    experiment   energy   machine

    1. (1) There are some very noisy as well.
    2. (2) This term we'll learn .
    3. (3) You can find out how people dig .
    4. (4) There are some interesting in our science lessons.
    5. (5) We often use electricity to create .

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