问题
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This passage mainly discusses ______ .A.the functions of carbon dioxide and waterB.the rol
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The passage mainly discusses______.A.why the change of meat-eating habit matters muchB.how
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The passage mainly discusses about______.A.business competitionB.buyers and sellersC.busin
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The passage is mainly written to______.A.discuss how people view a new inventionB.analyze
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This passage mainly discusses ______.A.two techni
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The passage mainly discusses ______.A.the necessity of social changeB.certain factors that