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(2014·烟台市第二次诊断)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。句意为:维生素D帮助我们的身体形成一种特殊的化学物质,并且这种化学物质反过来影响我们的大脑,使我们感到高兴。in turn相应地,转而;in particular特别地;in advance提前;in short简而言之。

答案: A

 

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