Books are made＿paper while paper is mainly made＿wood
A of;of B from;from Cof;from D from;of
选项是C
此题考察 make of和make from的区别.Books are made of paper 书是由纸做的.我们【能看见】书的【原材料】是纸,就用介词of.paper is mainly made from wood纸主要是由【木头】做的.我们在纸里【看不见 】【原材料木头】就用from.
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