Women who are exposed to second-hand some during their pregn

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Women who are exposed to second-hand some during their pregnancy_____be at risk of abortion.
A.can B.must C.should D.need
为什么选A

选A
句中some应该是smoke
先翻译：处于二手烟环境中的孕妇可能会有流产的危险.
这里can 表示理论上的可能.
情态动词表示可能性的辨析如下：
一、接近100%的可能
这当然只有must才具有这么高的可能性,它的意思是“一定”“肯定”,所作出的推测几乎接近事实.如：
That hat must be Tom's.那帽子一定是汤姆的.
He must be coming by bus.他一定会乘公共汽车来.
二、很有可能
表示可能性较大的情态动词主要有may,
should,ought to,它们大致相当于汉语的“可能”“应该”.如：
She should [ought to] be here soon.她应该很快就到.
We may be buying a new house.我们可能要买一座新房子.
三、一般性的可能
在所有表示推测的情态动词中,might和could所表示的可能性最小,由于它们的语气较委婉,较不确定,所以往往相当于汉语的“可能”“也许”“说不定”等.如：
He might be waiting for you.他可能在等你.
She might not like the idea.她或许会不赞成这个想法.
We could all be millionaires one day.我们有一天可能都成为百万富翁.
四、理论上的可能性
表示理论上的可能通常是用can,且可以用于肯定句中.如：
Food poisoning can cause death.食物中毒可导致死亡.
This kind of thing can happen every now and then.这种事情是随时可能发生的.
New England can be very warm in September.新英格兰有时9月份很热.
所谓理论上的可能性,就是指仅从理论上去考虑其可能性,至于实际情况如何,则不作考虑,比如说“食物中毒可导致死亡”,这只是理论上的一种推断,至于某人某次食物中毒了,他是否会死亡,则不在考虑之列——所以说,这种推测是非常“宏观”的!

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