There is no power like _____ power of confidence, and there is no student as competitive as ______

student who trusts his own abilities. [ ]

A . the; a          

B. a; the            

C. /; a          

D. the; /

社会学习论者的研究表明，受到奖励或指责的榜样对儿童具有 ()

A．替代强化作用

B．示范作用

C．暗示作用

D．激励作用