单选题 Since the energy crisis, these big cars have become a real liability. They cost too much to run.
A. lack of reliability B. substitute
C. costly means of transport D. disadvantage

【正确答案】 D

【答案解析】lack of reliability缺乏可靠性；substitute代替品；costly means of transport昂贵的交通方式；disadvantage缺点，不利条件。