These days, it is not unusual for 10-to 12-year-olds to publish their own websites or for second and third graders to begin computer classes.
如今,10到12岁的孩子发布自己的网站,二、三年级的学生开始上计算机课,已经不是什么新鲜事了。
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Similarly, when the researchers looked at entering and exiting test scores in first, second and third grades, they found that some classes made much more progress than others.