单选题 Oil is derived from the ______ of microscopic sea creatures, and is even older, according to most geologists.
  • A. layouts
  • B. reminders
  • C. remains
  • D. leftovers
【正确答案】 C
【答案解析】[解析] layouts规划；reminders暗示，提醒；remains残骸；leftovers剩菜，残余物。答案是C。