单选题 Ecological vehicles are made of materials that can be easily ______ once they are dumped.
  • A.realistic
  • B.racial
  • C.recycled
  • D.rebellious
【正确答案】 C
【答案解析】[解析] 环保车使用的材料使它们在被丢弃后还可以轻易地回收使用。