The increasing number of the unaccompanied children across the U. S. border press the United States to detain more and more chil

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问题 The increasing number of the unaccompanied children across the U. S. border press the United States to detain more and more children.
  
The United States pressured Mexico to step up detentions of migrants after the number of unaccompanied children arriving at the U. S. border soared to more than 44, 500 in the first six months of 2014. Last year, Mexican authorities apprehended nearly 36,000 children, more than half of whom were unaccompanied. By comparison, Mexico detained just 9, 600 children in 2013.
The cerebral cortex is the furrowed, outer layer made up of gray matter. It is responsible for higher-order functions like information-processing and language. Scientists have pinpointed some specific functions in the cerebral cortex but are still working on a complete map.

选项 A、正确
B、错误

答案B

解析 “the cerebral cortex”意为“大脑皮层”。从文中“still working on a complete map”可以看出,科学家还在研究。
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