题目内容
There are ____ principles and requirements we should follow by doing mechanical practice.
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It is believed that substitution drills that involve changes in forms are not more effective than those in which students simply replace the target part with another word.
Imitation, repetition and memorization can work seperately ,but we can not integrate them into an activity.
从其它层复制构件按钮在（）菜单栏下
源楼层只能是某一层，目标楼层也只能是某一层（）
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