( )不是由巴甫洛大提出的。
A．操作性条件性反射
B．反射、反射弧和反馈
C．第一信号系统和第二信号系统
D．动力定型
参考答案：A
Tom has planned a big party on Sunday and many friends _______ to take part in. [ ]
A. will invite
B. has invited
C. will be invited
D. has been invited
下列诗人属于晚唐时期诗人的是（）
A.李白
B.杜甫
C.杜牧
D.李商隐
