单选题 Three fundamental aspects of (forest conversation) are the protection of immature trees, the use (of proper) harvesting methods, and (provide) for an environment (that supports) reproduction.
  • A. forest conversation
  • B. of proper
  • C. provide
  • D. that supports


【正确答案】 C
【答案解析】将动词provide改为(动)名词providing，与the protection、the use词性并列而且一致。