单选题 Good habits are hard to develop while bad habits are easily ______.
  • A. kept up
  • B. caught up
  • C. drawn up
  • D. picked up
【正确答案】 D
【答案解析】[解析] 句意：好习惯很难形成，坏习惯却很容易养成。pick up有“获得，学会”的意思，故选D。