73. 抽菸是下列何者的原發危險因子(primary risk factor)? ①慢性阻性肺病(Chronic obstructive lung disease)②糖尿病(DM)③心臟病(heart disease)④頭頸癌(Head & neck cancer)⑤牙周病(periodontal disease) (A)①②③④ (B)②③④⑤ (C)①③④⑤ (D)①②④⑤