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  3. The smell from an old lady’s armpits can raise your spirits, a scientist in Pennsylvania claims. Her work also suggests that in

The smell from an old lady’s armpits can raise your spirits, a scientist in Pennsylvania claims. Her work also suggests that in

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问题     The smell from an old lady’s armpits can raise your spirits, a scientist in Pennsylvania claims. Her work also suggests that in contrast, the scent of a young child does nothing to improve your mood.
    Studies using animals have shown that smell is vital for conveying information. Rodents can detect and transmit fear through smell, for instance, and animals often identify a high - ranking member of a group by its smell. A recent study has shown that people can distinguish the body odor of both happy and fearful people. But the impact of body odor on people’s mood has hardly been explored at all.
    Denise Chen of the Monell Chemical Senses Center in Philadelphia hoped to find out more. So she recruited 30 volunteers in six different categories: girls and boys aged between three and eight, young adult women and men in their early twenties and elderly women and men in their seventies. The volunteers all gave samples of their body odor by strapping a gauze pad under each armpit and keeping it there for 10 hours.
    The participants were not allowed to use any perfumes or deodorants, or eat strong - smelling foods, in the four days before the samples were collected. They could shower, but only with unscented soap and shampoo. Odors were also collected from the homes of all the donors and combined into a neutral control smell.
    Chen then asked 308 university students to complete a 36 - part questionnaire that assessed how positive their mood was. Then they smelled the gauze pads from one of the gauze pads from
one of the six categories of people—without being told what the smells were. After this, the students answered the students answered around.
    People who had inhaled the samples taken from old women’s armpits respond significantly more positively, Chen found. "Old women had an uplifting effect" she says. The smell of young men, on the other hand, produced a depressive effect. In general, Chen will report in a future issue of the journal physiology and Behavior.
    Jeannette Haviland, of Rutgers University in New Jersey, who also worked on the project, says it’s possible that hormones make the body of young people signal aggression. But hormonal changes may make the odor of older people, especially women, signal that they are approachable. Alternatively, it could be that women in their golden years are generally happy, and that their odor can transmit this mood. " The air-borne chemicals that we collected from them— ’ I’eau de grandmere(smell of grandmother)’—may indicate that state," says Haviland.
It can be inferred from the passage that______.
选项 A、there has been little literature on the impact of body odor upon people’s moods
B、human beings can convey as much information through odor as animals
C、the relation between odor and mood has never been explored before
D、it is more beneficial to sniff an old lady than to smell a child
答案A
解析 推断题。答案在第二段的最后一句话。A和C都与原文有关，但C的说法太绝对，而且原文中没有呈现比较关系；A中的little更趋同于原文中hardly的意思；B和D虽都与原文有一点关联，但文章中的内容并不能推导出该结论，故选A。
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