13．According to the history，_______ main material for making tables has been wood，but ______ metal and stone have also been used．?（　�。�
A．the；/B．/；/?C．the； theD．/； the

分析 根據(jù)歷史，制作桌子的主要材料是木頭，但是金屬和石頭也被使用．

解答 答案：A．第一空main material后面有修飾語for making tables，因此是特指"制作桌子的材料"，加定冠詞，后面的metal和stone表示材料，都是物質名詞，不加冠詞，故選A．

點評 本題考查冠詞的用法辨析．學生應對a/an/the的用法及固定搭配多加記憶和積累．

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