教育实验是指研究者按照研究目的,______________或创设一定条件以影响改变研究对象,从而验证______________、探讨教育现象______________关系的一种研究。
You can _____ some bottles of wine, or some chocolates, or a bunch of flowers.
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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