(2014·煙臺(tái)市第二次診斷)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 advanceD．in short
A
考查介詞短語(yǔ)。句意為：維生素D幫助我們的身體形成一種特殊的化學(xué)物質(zhì)，并且這種化學(xué)物質(zhì)反過(guò)來(lái)影響我們的大腦，使我們感到高興。in turn相應(yīng)地，轉(zhuǎn)而；in particular特別地；in advance提前；in short簡(jiǎn)而言之。
答案：　A
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