Vitamin C helps our bodies make a special chemical, which _______ affects our brains, making us feel happy.
A．in allB．in turnC．in advance D．in short
B
詞組辨析。In all 總計 in turn 輪流，反作用于 in advance 提前  in short 總之
句意為維他命C可以幫助我們的身體制造出一種特殊的化學物質(zhì)，反過來可以影響我們的大腦，讓我們感到開心。
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