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精英家教網 > 高中英語 > 題目詳情

This kind of snakes ________ very dangerous.These kinds of metals ________ hard to find.


  1. A.
    is;is
  2. B.
    are;is
  3. C.
    is;are
  4. D.
    are;are
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Scientists made a great break through this year in England when the first "test tube" baby was born.The birth was the result of many years of research by doctors.The doctors did the research in groups to help the women who cannot conceive a baby in the normal way.

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