The vaccine(疫苗)was used to _______ the whole population _______ Bird Flu(禽流感)．


  1. A.
    keep; out of
  2. B.
    protect; from
  3. C.
    keep; away
  4. D.
    make; out of
B
解析：
be used to表示“被用來”，protect…from“保護某人以免受到……的侵害”。
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[　　]
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