2. 外语
  3. What is paper made? When we【C1】________ books or newspapers, we seldom stop and think about the things【C2】________to make them.【

What is paper made? When we【C1】________ books or newspapers, we seldom stop and think about the things【C2】________to make them.【

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问题     What is paper made? When we【C1】________ books or newspapers, we seldom stop and think about the things【C2】________to make them.【C3】________paper our lives would be very different.
    Paper is one of【C4】________important inventions(发明) of all time. The people in Egypt(埃及) first used a kind of grass-like plant to【C5】________ paper around five【C6】________ years ago. 3000 years later, a Chinese man created a new【C7】________of paper using pieces of old cloth. Then for several hundred years, people【C8】________the world had been using this Chinese method to make paper.  In 1838, a Canadian man invented a【C9】________method of paper-making using wood.  Today, most of the paper we use is made from【C10】________.
【C2】
选项 A、be used
B、used
C、using
答案B
解析 考查过去分词做定语。过去分词used表示被动，做定语，修饰前面的名词things。
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