2. 考研
  3. Ask why most people are right-handed, and the answer might fall along the same lines as why fish school(鱼成群地游). Two neuroscienti

Ask why most people are right-handed, and the answer might fall along the same lines as why fish school(鱼成群地游). Two neuroscienti

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问题     Ask why most people are right-handed, and the answer might fall along the same lines as why fish school(鱼成群地游). Two neuroscientists suggest that social pressures drive individuals to coordinate their behaviors so that everyone in the group gets an evolutionary edge.
    Approximately 85 percent of people prefer their right hand, which is controlled by the left hemisphere of the brain. One theorized benefit of locating a particular function in one hemisphere is that it frees the other to deal with different tasks. But that idea does not explain why population-wide trends for handedness exist in the first place.
    Moreover, evidence gleaned in recent years has overturned the long-held belief that human handedness is a unique by-product of brain specialization attributable to language. A suite of studies has revealed brain lateralization in species from fish to primates(灵长类). Last August, for instance, scientists discovered that in the wild, chimpanzees show hand preferences.
    The presence of lateralization throughout the animal kingdom suggests some benefit from it, contend neuroscientists Giorgio Vallortigara and Lesley Rogers. Also, last August, in the journal Behavioral and Brain Sciences, the two presented evidence to support their idea that social constraints force individuals toward asymmetry in the same direction. They noted, for example, that baby chickens attack more readily when a threat appears on their left.
Fish school suggests that______.
选项 A、it was a necessary evolutionary process
B、it has something to do with human right-handedness
C、they need to coordinate with other fish
D、their brain function is unique
答案B
解析 文章第一段介绍左右手习惯并非人类所独有，动物也呈现类似的特点，如鱼成群的游动。这是因为社会压力迫使个体调整自己的行为，这也形成了它们的进化优势。鱼成群的游动并非必要的进化过程，而是形成了进化优势，所以不能选择A。选项C和D在原文中没有提到。B项has／have something to do with和……有关。故选B。
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