The population of China___ to many times what it was in 1949, and most of its population ___ farmers.

A．have grown; are

B．have grown; is

C．has grown; is

D．has grown; are

可用于诊断损害部位，证实脑干病变存在的是（）

A.F波

B.M波

C.H反射

D.睡眠反射

E.自主神经反射