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题目材料：
Sensations of nausea in people are accompanied by higher-than-normal blood levels of a particular hormone, vasopressin. Therefore, either nausea triggers the production of vasopressin or abnormally high levels of vasopressin cause nausea.
Which of the following is an assumption on which the argument relies?
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ASensations of nausea are never present when vasopressin is at low levels.
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BHigh levels of vasopressin have no effect on the body other than to cause sensations of nausea.
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CSensations of nausea and high levels of vasopressin do not have a common cause that makes them occur together.
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DMild nausea causes the release of small quantities of vasopressin, and high levels of vasopressin cause intense nausea.
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EPeople differ in the blood level of vasopressin that is normal for them.
C显示答案
