According to the national assessment of educational progress ( naep ) , maths scores for nine - year - olds improved by nearly two percentage points between 1999 and 2004 , while those for 13 - year - olds rose one point 根据全国教育进步评估( naep )的统计显示， 8岁儿童的数学成绩在1999到2004年间提高了将近2个百分点，与此同时， 13岁儿童的数学成绩提高了百分之一。
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