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        1. Vitamin D helps our bodies make a special chemical,and this special chemical, ____ ,
          affects our brains,making us feel happy.?
          A.in turnB.in particular?
          C.in advanceD.in short?
          A    
            考查介詞短語在語境中的用法。in turn反之,反過來;in particular特別,尤其;in advance提前,預先;in short簡而言之。句意為:維生素D幫助我們的身體產(chǎn)生一種特殊的化學物質,而這種化學物質反過來又影響我們的大腦,讓我們感到高興。根據(jù)題意可知,A項正確。
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