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  3. The popular dietary supplement ginseng is said to improve one’s mood and all-around vigor, but a new study published in the Jour

The popular dietary supplement ginseng is said to improve one’s mood and all-around vigor, but a new study published in the Jour

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问题     The popular dietary supplement ginseng is said to improve one’s mood and all-around vigor, but a new study published in the Journal of the American Dietetic Association suggests that ginseng has little of any effect on psychological health. The study, conducted by researchers at Oregon State University and Wayne State University, is one of the most extensive peer-reviewed studies of ginseng ever conducted.
    "Ginseng is being marketed to relatively healthy young people as a way to feel even better — a kind of yuppie(雅皮士)supplement," said Bradley J. Cardinal, an associate professor in the College of Health and Human Performance at Oregon State, "We found it had no real effect on mood at all. It certainly did not live to some of its over-enthusiastic marketing claims." Among the claims, the authors say, were that ginseng enhances mood, leads to positive well-being, and generally makes you feel better. Marketing ploys used to push ginseng promoted its use by astronauts and professional athletes, and claimed it did everything from easing childbirth to working as an aphrodisiac(壮阳剂).
    The study by Cardinal and Hermann J. Engels of Wayne State University focused only on the alleged psychological properties of ginseng. The researchers gave a regular, 200mg daily dose of ginseng to one group of volunteers for eight weeks. A second group received a doubled dose of 400mg daily: the third group received a sugar pill. None of the individuals knew what they were taking. At the end of the eight-week period, the researchers measured the effects of the supplements on the volunteers’ "total mood disturbance" using a 65-question "Profile of Mood States" inventory. To eliminate bias, the researchers evaluated the tests without initially knowing which subjects were taking ginseng and which were taking placebos. They compared the results with a baseline survey of the volunteers taken just prior to the study. They found no significant difference among the three groups.
    "What these findings on psychological effect do is to extend earlier research from our lab that examined physiological outcomes of ginseng," said Wayne State University’s Engels. "Our previous research found, using a controlled physical exercise stress test, that ginseng had no effects when given to normal, healthy adults."
What is the main idea of the passage?
选项 A、Ginseng is one of the most popular dietary supplements.
B、New study questions the role of ginseng as mood enhancer.
C、The study of ginseng is one of the most extensive peer-reviewed studies.
D、The study focused on the alleged psychological properties of ginseng.
答案B
解析 文章第1段首句首先指出，ginseng(人参)作为膳食补充可以改善人的情绪，增强全身的活力，但是转折连词but后的内容却说明了实际情况：ginseng has little of any effecton psychological health。以下内容都是围绕该实际情况而展开的，B)表述内容与文章主旨一致，故为答案。
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