A model or an experiment in a science class can help us see things which would       remain hidden．


  1. A.
    therefore
  2. B.
    yet
  3. C.
    otherwise
  4. D.
    still
C
試題分析：考查副詞辨析。A因此；B可是；C否則，要不然；D仍然；句意：科學課上的實驗可以幫助我們看到要不然仍然隱藏的事情。故C正確。
考點：考查副詞辨析
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