12．Our class president went up to Cambridge at the age of 15 to studyChemistry （化學(xué)）．

分析 我們的班長(zhǎng)在15歲的時(shí)候去劍橋?qū)W習(xí)化學(xué)．

解答 答案：Chemistry 
化學(xué)是一門學(xué)科，泛指，其前不加冠詞．

點(diǎn)評(píng) 專有名詞的第一個(gè)字母要大寫．

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