题目内容

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
词组辨析。In all 总计 in turn 轮流，反作用于 in advance 提前  in short 总之
句意为维他命C可以帮助我们的身体制造出一种特殊的化学物质，反过来可以影响我们的大脑，让我们感到开心。
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