Moffitt said it's still unclear why some children have better self－control than others, though other researchers have found that it's mostly a learned behaviour, with relatively little genetic influence. But good self－control can run in families because children with good self－control are more likely to grow up to be healthy and prosperous parents.

　　“Some of the low self－control study members are more likely to be single parents with a very low income and the parent is in poor health and likely to be a heavy substance abuser，” said Moffitt. “So that's not a good atmosphere for a child. So it looks as though self－control is something that in one generation can influence the next generation.”

　　But the good news, according to Moffitt, is that self－control can be taught by parents, and through school curricula that have been shown to be effective.the purpose of the study is to ________．

　　A．measure children's self－control－control－controlfind the effect low self－control brings to children17．Which of the following is TRUE of the study?

　　A．The children were tested in knowledge.

　　B．About 1，000 children got involved in it.It was being carried out worldwide.

　　D．It had lasted for about 10 years.

　　18．It has proved that children with low self－control tend to ________． be parents

　　D．be ill at 3 to 10who can help children get self－control?to the text, which of the following statements is NOT true?

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