Scans showed that grey matter density (密度) in the brain was greater in bilinguals than in people without a second language. But the longer a person waited before mastering a new language, the smaller the difference it will be.

　　“Our findings suggest that the structure of the brain is changed by the experience of learning a second language，” said the scientists.

　　It means that the change itself increases the ability to learn.

　　Professor Dylan Vaughan Jones of the University of Wales, has researched the link between bilingualism and maths skills. “Having two languages gives you two windows on the world and makes the brain more flexible (灵活的)，”he said. “You are actually going beyond language and have a better understanding of different ideas.”

　　The findings were matched in a study of native Italian speakers who had learned English as a second language between the ages of 2 and 34.Reading, writing, and comprehension were all tested. The results showed that the younger they started to learn, the better. “Studying a language means you get an entrance to another world，” explained the scientists.

　　48．The main subject talked about in this passage is ________.

　　A．science on learning a second language

　　B．man's ability of learning a second language

　　C．language can help brain power

　　D．language learning and maths study

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