A series of stimulus policies and supportive measures taken by the government ________ to promote change in the economic environment in this area.

A．are expecting

B．are expected

C．is expecting

D．is expected

正常胎儿整个大脑皮层脑裂形成时期为（）

A.12~16周 

B.17~23周 

C.24~26周 

D.27~29周 

E.30周以后