单选题：Since 1992, cancer incidence rates among black Americans ___

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Since 1992, cancer incidence rates among black Americans __________. A．A　have been going up and down
B．B　have remained stable
C．C　have increased
D．D　have fallen

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Cancer is more treatable if it is detected __________.

Cancer is more treatable if it is detected __________.A．A　in an early stage B．B

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It is obvious that daily newspapers carry more information t

It is obvious that daily newspapers carry more information than the Sunday paper

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Thus our conviction is reinforced that only social revolutio

Thus our conviction is reinforced that only social revolution can really solve t

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根据以下材料，回答题。The word distinctive in the passage is closest in

根据以下材料，回答题。The word distinctive in the passage is closest in meaning to

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Listen again to part of the talk．Then answer the question． W

Listen again to part of the talk．Then answer the question． What does the profess

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