单选题：61%of ulcer risk seems to be caused by

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题目内容：
61%of ulcer risk seems to be caused by A．unknown factor
B．economic factor
C．environmental factor
D．genetic factor
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答案解析：

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根据下列文章,请回答题。A IDSThe World Health Organization(WHO)says as m

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In 2004，most of the unemployed in the US were women．A．Right B．Wrong C．Not mentio

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