语法与词汇 Scientists conclude that nonsmokers who must _____ inhale the air polluted by tobacco smoke may suffer morethan the smokers themselves.无

【正确答案】 A

【答案解析】句意：科学家指出在被迫吸入烟草污染过的空气之后，那些非吸烟者受到的危害比吸烟者更加严重。 involuntarily非自发地，被迫地。 instantaneously瞬间地。 spontaneously不由自主地。 reluctantly不情愿地。