下列动物的行为不属于先天性行为的是[ ]
A．燕子筑巢
B．狗绕道取食
C．老马识途
D．小狗跳火圈
A
To lose themselves in the net bar _____ on teenagers' future life.[ ]
A. have a bad effect
B. has a bad effect
C. have a good effort
D. has a good effect
严重挤压伤后，最可能出现的为
A．大量失血
B．低血溶性休克
C．剧烈疼痛
D．急性肾衰竭
E．截瘫
