狗听到主人唤它的名字就跑过来，是（）
A.无条件反射
B.第一信号的条件反射
C.第二信号的条件反射
D.本能的反射
参考答案：B
4．--- Will you join us in the dance tonight?
--- I’m afraid not. My uncle is coming by train at 7 pm and I_________him at the station then.
A．will meet
B．am about to meet
C．will be meeting
D．Meet
按肌肤干瘪者其临床意义是（）。
A.阳虚有寒
B.气血不足
C.津液不足
D.湿热蕴结
E.瘀血内停
