单选题 Some people think it's ______ to smoke with a cigarette holder,
A. flexible B. sophisticated C. versatile D. productive

【正确答案】 B
【答案解析】sophisticated老练的。句意:一些用烟斗抽烟显得老练。flexible易弯曲的,灵活的; versatile多才多艺的,通用的;productive多产的,生产地。