“Early to bed, early to rise（起身）makes people healthy, wealthy and wise（健康，富有，聪明）.” This is an old English saying. Children should have ten hours' sleep every night, or they can't do their work very well. They will not be wise. The body needs exercise. Walking, running, swimming and playing ball games are all exercise. Exercise keeps the body strong.

如图：Rt△ABC≌Rt△DEF，则∠D的度数为（ ）

将x＝$\frac{2}{3}$代入反比例函数y＝－$\frac{1}{x}$中，所得函数值记为y₁，又将x＝y₁＋1代入函数中，所得函数值记为y₂，再将x＝y₂＋1代入函数中，所得函数值记为y₃，……，如此继续下去，则y₂₀₁₂的值为 （      ）

下列变化属于物理变化的是（  ）

Sorry, I can't.