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

题目分类：理工类
题目类型：单选题
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题目内容：

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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答案解析：

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