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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?

    A    


    解析:

       考查介词短语在语境中的用法。in turn反之，反过来；in particular特别，尤其；in advance提前，预先；in short简而言之。句意为：维生素D帮助我们的身体产生一种特殊的化学物质，而这种化学物质反过来又影响我们的大脑，让我们感到高兴。根据题意可知，A项正确。

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