It came as _____ great shock to us that many people lost their lives in _____ latest earthquake in Northwest China’s Qinghai Province.

A．a; a

B．a; the

C．/ ; the

D．the ; /

哪项不是二尖瓣狭窄早期的表现()

A．呼吸困难

B．咳嗽

C．下肢水肿

D．咯血

E．心悸