For many Beijingers, dreams of living in ___________ green area are becoming___________ reality.  

A．a; a

B．the; the

C．不填;不填

D．不填;a

慢性支气管炎最突出的症状是

A．长期反复咳嗽、咳痰
B．反复咳脓性痰
C．间歇少量咯血
D．逐渐加重的呼吸困难
E．活动后心悸气急