【題目】Vitamin C helps our bodies make a special chemical, which __________ affects our brains, making us feel happy.

A. in all B. in turn

C. in advance D. in short

【答案】B

【解析】句意：維生素C可以幫助人體產(chǎn)生一種特殊的化學(xué)物質(zhì)，這種化學(xué)物質(zhì)反過來又影響我們的大腦，使我們快樂。in all總共,總計(jì);總之;in turn依次地，輪流地；轉(zhuǎn)而，反過來；in advance預(yù)先，提前;in short總之；簡(jiǎn)言之。

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