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The plants grown in greenhouse ________ from the wind, rain and insects.


  1. A.
    protect
  2. B.
    protected
  3. C.
    is protected
  4. D.
    are protected
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A.Studies find plants can recognize, communicate with relatives.

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People have been growing chrysanthemums(菊花)for more than 2,000 years. Mums make bright and colorful gardens. People in China and other Asian cultures make tea with the flowers.

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