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  3. A researcher says lead in the environment could be a major cause of violence by young people. Doctor Herbert Needleman is a prof

A researcher says lead in the environment could be a major cause of violence by young people. Doctor Herbert Needleman is a prof

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问题      A researcher says lead in the environment could be a major cause of violence by young people. Doctor Herbert Needleman is a professor at the  University of Pittsburgh  School  of Medicine in Pennsylvania. He says the【B1】______ of lead in the brain changes the neurons that control actions and that can cause a person to act in antisocial and【B2】______ ways.
     Lead is a metal that is【B3】______ dangerous to babies and young children. They can get it into their bodies by breathing or【B4】______ lead dust, or by eating soil or pieces of lead paint. Children with high levels of lead can【B5】______ brain and nervous system damage, learning【B6】______ , slow growth, headaches and hearing loss.
    In the 19th century, Doctor Needleman found lower scores on【B7】______ tests even in children who did not have such signs of lead【B8】______ . After that, lead was removed from gasoline and paint in the United States. Yet many homes still have old lead paint. Lead was also used in older water pipes. In fact,【B9】______ .
The newest research shows that even very small amounts of lead in bones can affect brain development.   【B10】______ . In 2008, such tests were done on 190 young people who were in jail and the findings showed that their average levels were higher than normal. And, in 2002,【B11】______ . Yet these levels were still considered safe by the government.  
【B4】
选项
答案swallowing
解析 介词by后面应为功名词，根据or前的breathing可知，此处应该是与breathing并列的一个身体运作，注意swallowing有两个1。
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