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Genera Technologles 0rders 25 Inore tests before the elld of the year．
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Hundreds of species are declared to be extinct（A级）in the coming century．
Scientists ignored lake Vida because they thought that a lake of ice__________．
The Substance can be added to gasoline to accelerate（B级）the speed of automobiles．
The first time the author played the violin in the street．he expected
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