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Unit6 When was it invented ？,Section B 3a-Selfcheck,There are so many inventions in our daily life .They are useful and helpful .,My favorite invention should be . 我最喜欢的发明应该是 的。,My favorite invention should be ,helpful,convenient,high-technology,new,great,creative,necessary,popular,colorful,important,useful,computer,Computer was invented by John in 1971.,searching for . with friends. online.,It used for .,information,communicating,shopping,I think computer is (adj.),