以呼吸困难、胸痛及咯血为主要表现的疾病是（）。

A.肺血栓栓塞症

B.支气管哮喘

C.慢性支气管炎

D.COPD

E.肺心病

More than 60 million people in southwestern China ________the drought nowadays as a result of less rainfall, environmental damage and so on

A．are affecting

B．are being affected by

C．are being effected by

D．are effecting