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  3. We often attribute key characteristics to one of our parents:" He gets his athleticism from his father." " Her quickness to ange

We often attribute key characteristics to one of our parents:" He gets his athleticism from his father." " Her quickness to ange

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问题     We often attribute key characteristics to one of our parents:" He gets his athleticism from his father." " Her quickness to anger—that’s all her mother." Whether the genetics are actually pulling the strings in these cases is another story. But a growing body of research has suggested that heredity does apply to mood disorders—including depression, which afflicts more than 2.8 million adolescents in the U.S. alone—and that there is compelling evidence hereditary ties are strong between mothers and daughters.
    Researchers in a new study of 35 healthy families published in The Journal of Neuroscience this week have found that the brain’s corticolimbic system, responsible for the regulation of emotion—and associated with the manifestation of depressive symptoms—is more likely to be passed down from mother to daughter than from mother to son or father to child. This finding, which supports past evidence from animal research and clinical studies on depression, could provide a better understanding of the role genetics play in mood disorders and other conditions, allowing better identification of at-risk groups and preventive measures.
    "Our study’s uniqueness," says lead author Fumiko Hoeft, an associate professor of psychiatry at the University of California, San Francisco," is that we’re the first one to get the whole family and scan both parents and offspring to look at how similar their brain networks are. And we joke about inheriting stubbornness or organization— but we’ve never actually seen that in human brain networks before."
    Hoeft cites Dr. Seuss’ s children’ s book Horton Hatches the Egg—in which an elephant sits on a bird’s egg in lieu of its actual mother and a hybrid elephant-bird ends up hatching—as a cartoonish example of the inspiration for this research. The forces of both nature and nurture are at play. "What’s relevant is that it shows the profound influence of prenatal impact on offspring, which we often forget," Hoeft adds. "Prenatal input is considered in the most severe cases, like alcohol and smoking. But it happens in everyone. A mom being stressed has an impact on her child’s outcome."
    The finding is particularly relevant in light of the recommendations issued today by the U.S. Preventive Services Task Force, which include the screening of pregnant women and new mothers for depression. Although this recommendation is primarily a response to concerns about the role of the "nurture" side of the equation, Hoeft seeks to unravel how biology plays its part as well.
The research is remarkable in that
选项 A、it is based upon first-hand solid evidence.
B、its subjects are inspired by a caricature.
C、its researchers resort to random samples.
D、its findings contradict conventional ideas.
答案A
解析 (1)题干照应第3段的Our study’s uniqueness。(2)根据文章，“我们率先对全家人研究，扫描了父母和后代(的大脑)，审视了大脑连接网络的相似性”(第3段：first，networks)。“以前的研究者从未真正观察过这种连接”(第3段：never actually seen)。这些语句的言外之意便是选项[A]的表达。
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