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We need to know something about the structure and operation of science because___
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Studies show depression______.A．is more common today than in the past decadesB．was more co
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Linda suggested __________ anything about it until we found out more facts.A. not to
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We now know that about ____ of all the kinds of seaweed are animals.A: one fourB: once
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Today we know more about ______. We’re better at preventing illness.A: medicineB: pollu
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All we know about the origin of language is that men, unlike animals, ______ invented cert
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From the tone of the passage we know that the author is ______.A.doubtful about the necess
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