2. TB is caused by a tenacious bacterium, *mycobacterium tuberculosis*. One victim can cough up to 4 billion bacilli a day, so it's not surprising that      most people are infected by inhaling droplets of saliva.     
(A) 人大多是經由接吻而感染
(B) 大多數的人是經由飛沫傳染
(C) 人感染大多都是因為吸入沙塵
(D) 人大多是經由體液而感染

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