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Most environmental problems are caused by people.()..
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The road was (enlarged )the year before the last.....
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Ventilation ().A、is a system for moving fresh ai.....
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What is the problem with human beings according t.....
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How does the author summarize the volunteer experi.....
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调节血糖浓度的激素A.食物经消化吸收的葡萄糖 B.脂肪及某些.....
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