To learn English well,we should find opportunities to hear English ______as much as we can.    [ ]

A. speak      

B. speaking        

C. spoken          

D. to speakish

社会主义国民经济持续、快速、健康发展的必要条件是 ( )

A．社会稳定

B．企业经济效益高

C．国民经济比例协调

D．市场体制完善