B. The Mexican family did seasonal work in Oregon each year.

　　C. The author was inspired to help others by the Mexican family.

　　D. What made the writer moved was the tamale given by the girl.

　　B

　　体裁 议论文 题材 大脑的研究 词数 390

　　What makes humans smarter than other animals? We’ve got a bigger brain, of course. But when it comes to brains, is bigger always better?

　　Traditionally, scientists have thought that humans’ superior intelligence derived (源于) mostly from the fact that our brains are three times bigger than those of our nearest living relatives, chimpanzees. People even used to believe that because men have slightly larger brains than women that men are smarter.

　　This, however, is not the truth. Scientists at University College London in the UK have found that brain organization, and not brain size, is the key to the superiority of human intelligence, reported Live Science.

　　Through millions of years of evolution, our ancestors were constantly pushed to get smarter so that they could meet the demands of new environments. However, holding this growing intelligence in increasingly large brains was not the best choice because bigger brains require more energy to power. “This is when reorganization may come into play, ”said Christophe Soligo, a member of the London research team.

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