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There are two factors which determine an individual's intelligence． The first is the sort of brain he is born with． Human brains differ considerably, some being more capable than others． But no matter how good a brain he has to begin with, an individual will have a low order of intelligence unless he has opportunities to learn． So the second factor is what happens to the individual--the sort of environment in which he is brought up． If an individual is handicapped environmentally, it is likely that his brain will fail to develop and he will never attain the level of intelligence of which he is capable．
Theimportanceofenvironmentindetermininganindividual'sintelligencecanbe?
demonstrated by the case history of the identical twins, Peter and Mark． Being identical, the twins had identical brains at birth, and their growth processes were the same． When the twins were three months old, their parents died, and they were placed in separate foster homes． Peter was raised by parents of low intelligence in an isolated community with poor educational opportunities． Mark was reared in the home of well-to-do parents who had been to college． He was read to as a child, sent to good schools, and given every opportunity to be stimulated intellectually． This environmental difference continued until the twins were in their late teens, when they were given tests to measure their intelligence． Mark's LQ． was 125, twenty-five points higher than the average and fully forty points higher than his identical brother． Given equal opportunities, the twins, having identical brains, would have tested at roughly the same level．
This selection can best be titled__________．
文章第一段提到有两个因素影响人的智力，即先天因素及后天的环境因素。之后提到了两者的关系，如果环境不利，大脑也不可能发展到相应的智力水平。第二段举例说明了环境对智力的影响。因此B项作为标题最恰当
《义务教育数学课程标准（2011年版）》强调，课程内容要反映社会的需要、数学的特点，要符合学生的认知规律。课程内容的组织要重视过程，处理好（）的关系。
设α是某一方程组的解向量，k为某一常数，则kα也为该方程组的解向量。（ ）
案例：
在有理数运算的课堂教学片段中，某学生的板演如下：
针对该学生的解答，教师进行了如下教学：
师：请仔细检查你的演算过程，看是否正确无误？
生：好像正确吧。
请分析例题1、例题2中每一步运算的依据。（10分）
初中数学课程是一门国家课程，其主要内容包括课程目标、教学内容、教学过程和( )等
教师职业道德区别于其他职业道德的显著标志就是（ ）。
对高中数学的评价，下列说法错误的是( )。
