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1.20世纪70年代,美国人发明了照相机和手机。

         ,Americans developed digital cameras and cellphones.

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(   ) 1. A. to find    B. finding

       C. to use    D. using

(   ) 2. A. recycle    B. reuse

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Act Now to Save Water Water is very important to all the living things in the world, including human beings.

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