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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?

A    


解析:

   考查介詞短語在語境中的用法。in turn反之,反過來;in particular特別,尤其;in advance提前,預先;in short簡而言之。句意為:維生素D幫助我們的身體產生一種特殊的化學物質,而這種化學物質反過來又影響我們的大腦,讓我們感到高興。根據題意可知,A項正確。

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A. people feel happy and energetic in the sun          

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    B. Sunlight can be dangerous as it causes skin cancer.

    C. Sunlight does a great deal of good to our health.

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