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对象和方法一、对象随机抽128名在校学生作智力正常组（IQ71～136），按性别、年龄和地区等2：1配对，抽同区弱智学校病因不明的智力低下（MR）儿童作MR组，其中男34名，女30名。两组共192名．年龄均为9岁～14岁。二、方法1．智测采用书氏儿童智力量责（WISC－CR），MR组加做社
Subjects and Methods (1) Subjects randomly selected 128 schoolchildren of normal intelligence group (IQ71 ~ 136), matched by 2: 1 of gender, age and region, and smoked children with mental retardation MR group, of which 34 men and 30 women. A total of 192 two groups. The ages are 9 years old to 14 years old. Second, the method 1. Wisdom test using Children’s mental capacity (WISC-CR), MR group plus do clubs