therefore，

　　to put in the right things. Irrelevant (不相关的) information will clutter (混乱) working memory.

　　The question many researchers are struggling with is how to help children with this problem，

　　which appears to be closely related to a lack of attention.

　　“In children with learning difficulties，

　　it becomes a huge issue，

　　especially around middle school，

　　when the demands on working memory really grow，

　　” said Dr. Mel Levine，

　　co­founder of All Kinds of Minds，

　　a nonprofit organization in North Carolina that studies learning difficulties.

　　Memory training may help improve working memory. Alloway has a tool that allows teachers to assess (评定) the working­memory capacity of children as young as 4； it has been used in 35 schools across Britain.

　　Levine’s organization trains teachers through a program called Schools Attuned，

　　which is working with several thousand schools across the United States，

　　Canada and Europe. While he is not sure working memory can be expanded，

　　Levine said children can be taught ways to do better in school.

　　31．Which of the following is a characteristic of working memory？

　　A．It has a limited capacity.

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