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     Vitamin D helps our bodies make a special chemical，and this special chemical，

    __________，affects our brains，making us feel happy.

       A. in turn            B. in particular         C. in advance    D. in short

     

    【答案】

     A

     

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    1. 1.

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      3. C.
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      1. A.
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      3. C.
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      1. A.
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