单选题 One way to maintain social stability is to {{U}}crack down{{/U}} on crime while creating more jobs.
  • A. clamp down on
  • B. settle down to
  • C. look down upon
  • D. boil down to
【正确答案】 A
【答案解析】crack down on：打击；clamp down on：打击，抑制；settle down to：安心做……；look down upon：瞧不起；boil down to：归结为