①给小白鼠注射一定量的胰岛素后,小白鼠休克
②当细菌进入人体后,机体产生特异性的抗体与之结合,从而抑制细菌繁殖
③小猪听到主人“噜噜”叫声就奔向主人
A:体液调节、免疫调节、反射
B:反射、体液免疫、激素调节
C:体液调节、过敏反应、反射
D:反射、自身免疫、体液调节
①____Are you doing your homework?
②____Where's the panda from?
③____Can we wear a hat in class?
④____What's she doing?
⑤____Why do you want to see the koalas?
A. Because they're interesting.
B. She's listening to a CD.
C. She's from China.
D. Yes, we can.
E. Yes, I am.
____ ____ ____ = ____
我国是在哪个时期进入奴隶社会的?( )