◎ 题干
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
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“Vitamin D helps our bodies make a special chemical, and thisspecial chemical,____, affectsour brains, making us feel happy.[ ]A. in turnB. in particular C. i…”主要考查了你对  【介词和介词短语】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。