问题
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What was one result of the increased use of machinery on farms of the United States?A.Pric
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What was the result of Frank Dale‘s first steps ? 查看
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What would be the likely result of the melting of the ice cap?A.Warmer water temperature.B
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What does the professor mainly discuss?A.The development of the modern skyscraper.B.The sk
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What is the result of the experiment with rats an
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What is the result of he nation’s fossil-fuel ad