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  3. Online social networks are massively influential, yet we understand very little about the impact they have on our brains. Recent

Online social networks are massively influential, yet we understand very little about the impact they have on our brains. Recent

admin2013-08-03  10
问题     Online social networks are massively influential, yet we understand very little about the impact they have on our brains. Recently, scientists have found a direct 【C1】______ between the number of Facebook friends a person has and the size of【C2】______ brain regions. The study also shows the more Facebook friends a person has, the more real-world friends he is【C3】______to have.
    Facebook users who have a【C4】______of friends also tend to have smaller circles of friends in the real-world and,【C5】______ those who have thousands of friends on Facebook are likely to have larger circles offline, according to the study. The findings support the【C6】______ that most Facebook users use the site to【C7】______their existing, real-life social relationships, maintaining or reinforcing these friendships,【C8】______creating a network of entirely new,【C9】______friends.
    The researchers scanned the brains of 125 university-aged Facebook users,【C10】______ these scans to the size of their friend networks online and the real-world. Those with larger Facebook networks had larger amounts of grey matter in several regions of the brain. One of these regions, the amygdala, is 【C11】______with processing memory and emotional responses. Pairing this【C12】______ another recent study, the researchers show increased volume grey matter in the amygdala【C13】______ a larger network of real-world friends.【C14】______these studies show a large network of online friends also point to an increased volume of grey matter—【C15】______ information processing occurs. In addition to brain scans, the participants were asked questions 【C16】______ to compare the size of their online networks to the size of their real-world networks.
    The study【C17】______the correlation between the number of friends online【C18】______ offline. Still, it is not possible from the【C19】______to say whether having more Facebook friends makes the regions of the brain larger【C20】______ whether some people are "hard-wired" to have more friends.
【C4】
选项 A、number
B、handful
C、plenty
D、quantity
答案B
解析 名词辨析题。句意为：根据该研究，那些只拥有少量“脸书”好友的人可能在现实中朋友圈也比较小；相反，那些在“脸书”上拥有成千上万好友的人在线下的朋友圈也比较大。两个分句分别介绍了两个相反的现象，因此，由后一分句的thousands of可知本题应选择表示数量少的名词，故handful“少数的”为本题答案。其余三个选项均表示数量较大，不能与thousands of形成相比，因此均应排除。
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