单选题：Amore research is needed to see if there is a link between b

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Amore research is needed to see if there is a link between biological differences and __________. A．A　cancer sites
B．B　stages of diagnosis
C．C　cancer death rates
D．D　socioeconomic disparities

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Why do epidemiologists often study two groups of people?

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In fall 2006, the National Basketball Association (NBA) star

In fall 2006, the National Basketball Association (NBA) started using basketball

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In this part there are passages and one listing, each follow

In this part there are passages and one listing, each followed by five questions

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The word unique in the passage is closest in meaning to

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People from many countries were drawn to the United States b

People from many countries were drawn to the United States by the growing cities

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