We must keep ________ of nature.


  1. A.
    health
  2. B.
    fit
  3. C.
    healthy
  4. D.
    balance
D
思路分析：keep既可以作系動詞，也可以作及物動詞，后跟名詞作賓語．A、B、C項填入句中語法正確但意思不通．這句意思是“我們應當保持生態(tài)平衡”．
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