教育心理学对教育实践的作用可表述为具有描述、()、预测和()的作用。
参考答案:解释;控制
—Are the pencils in the box?
—________. [ ]
A. Yes, it isn't
B. No, they aren't
C. They aren't
D. It is
水灰比应与天气阴暗,气温高低,通风情况等因素无关。