单选题 Doctors say that people can dramatically reduce their risk of heart disease by quitting smoking and adopting an ______ lifestyle.
  • (A) acting
  • (B) active
  • (C) action
  • (D) actively


【正确答案】 B
【答案解析】[结构+词汇] 形容词位置，active(活跃的)
[错误答案] (A)acting作形容词出现在名词前时，会变成“代理的，装腔作势的”等其他意思，所以是错误答案。