--Growing population resulted in growing rubbish.

--There is possibility that rubbish ________the major threat to human beings.

A．becomes

B．is becoming

C．became

D．would become

Brunnstrom哪一阶段出现分离运动（）

A.Ⅱ阶段

B.Ⅲ阶段

C.IV阶段

D.Ⅵ阶段

E.I阶段