下列属于正强化的是（）。
A.奖学金
B.对成绩的认可
C.表扬
D.给予学习和成长的机会
参考答案：A, B, C, D
— Is your lifestyle the same _____ Linda's, Jerry?
— No, mine is quite different _____ hers. [ ]
A. as; from
B. as; as
C. from; as
D. from; from
牛的正常脉搏数是40-80次。
