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
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(答案→)A. might; from
B. will; by
C. should; in
D. shall; on
解析：考察情态动词。本题第一空might也许；will将要；should应该；shall将要；句意：鲸鱼搁浅也许是由多种因素导致的，如疾病或者海洋里的噪音导致的迷失方向或者来自石油钻探。句中的from表示原因。第一空的might也许，表示不确定的原因，因为后面提出了多个具体的解释。故A正确。