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
网友回答
A. in turn
B. in particular
C. in advance
D. in short
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。