Whale beachings（搁浅）_______ be caused by factors such as illness, or disorientation（迷失方向）caused by extra noise in the oceans, ______ shipping or oil and gas drilling.

A．might; from

B．will; by

C．should; in

D．shall; on

伴有呼吸困难与发绀的突发性胸部剧痛或绞痛常见于（）

A.心绞痛

B.急性支气管炎

C.肺栓塞

D.胸膜炎

E.肺淤血