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_________（47）A.Humans have no direct perception o..
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She was never 【courageous】enough to ask for promo..
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_________(57)A.things B.chemicals C.water D.air..
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补全短文(阅读以下材料 回答第46——50题)VisionHuman vision like th..
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_________（50）A.Humans have no direct perception o..
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What is NOT true of the effectiveness ofsunscree..
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