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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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