()对促进体育学习具有指向和强化的作用。
A.技能指导
B.坚持实践
C.不断哟化
D.兴趣
参考答案:D
从岸上看水中的物体时,会感到水中物体的位置比实际位置高一些,这是光的______现象,从岸上向水中看时,能看到岸边的树木在水中的倒影,这是光的______现象.
China is becoming stronger and stronger. It is no longer_________ . [ ]
A. what it used to be
B. what it was used to being
C. what it used to being
D. what it was used to be