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【单选题】
Why does HIV epidemic in some of the new EU member states and their bordering countries keep growing?
A.
In these countries heroin injecting is more common.
B.
People in these countries are not always seeking treatment for cocaine-related problems.
C.
People in these countries like to use crack rather than heroin.
D.
These countries are poorer than their western neighbors and can not provide adequate healthcare.
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A.
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A.
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①②③④⑤
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D.
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