(2014·煙臺市第二次診斷)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 advanceD．in short
A
考查介詞短語。句意為：維生素D幫助我們的身體形成一種特殊的化學物質，并且這種化學物質反過來影響我們的大腦，使我們感到高興。in turn相應地，轉而；in particular特別地；in advance提前；in short簡而言之。
答案：　A
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