解析：细节理解题。根据文章最后一段最后一句“The pattern of development can also be affected by factors like diet，hours spent in school or the number of children in their families”可知选B项。

　　答案：B

　　10.What does the underlined word “it” in the second paragraph refer to？

　　A.The discovery.　B.The pattern.

　　C.Intelligence.

　　D.Influence.

　　解析：词义猜测题。根据第二段第一句“The discovery，some experts said，could help scientists understand intelligence in terms of the genes that develop it and the

　　childhood experiences that can improve it.”这个发现能帮助科学家在基因方面和童年经历方面理解智商，这些基因是发展智商的，而童年的经历能改善智商。由此可知C项正确。

　　答案：C

　　11.According to the passage， which of the following statements in NOT true？

　　A.People didn't know whether intelligent children's brains grow differently from average children's before the discovery.

　　B.As a child grows older，the brain cortex grows thicker and then thins out.

　　C.There is the possibility that researchers will know what influences the development of brain in the future.

　　D.The researchers has found out why the brain's general pattern has changed.

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