The researchers found that average children(IQ scores 83 to 108)reached a peak of cortical thickness at age 7 or 8. Highly intelligent children(121 to 149 in IQ)reached a peak of thickness much later， at 13. One explanation is that the brains of highly intelligent children are more changeable， swinging through a higher trajectory(轨道)of conical thickening and thinning than occurs in average children.

　　Thompson said the new study opened up huge possibilities because researchers should be able to find the factors that influence the brain by looking at the scan patterns found by the researchers. The Bethesda children have had genetic samples taken from their cells， so genes that have even the smallest influence on the brain should be discovered. The pattern of development can also be affected by factors like diet， hours spent in school or the number of children in their families，and these may come to light by asking parents how they raised their children.

　　语篇解读：本文属科技说明文。新研究表明：高智商孩子的大脑发育异于普通孩子的大脑发育。9.According to the passage， what factors may not affect the development of a child's brain pattern？

　　A.What kind of diet a child eats.

　　B.How much exercise a child does.

　　C.How many hours a child spends in school.

　　D.How many children there are in the family.

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