脊髓灰质炎的病理变化主要在（）
A.脊髓胸段
B.脊髓颈段和腰段
C.脑神经运动神经核
D.脊髓颈段
E.脊髓椎体传导束
参考答案：B
下列哪一项可作为影响目标行为的强化因素（）
A.知识
B.态度
C.信念
D.个人的价值观
E.父母、同伴的赞扬劝告
Tell him not to eat _______ meat, it's bad for his health.
[ ]
A. much too
B. too much
C. too many
D. many too
