听下面一段材料，回答第1-3题。
| 听下面一段材料，回答第1-3题。 1. What did Marco Polo see when he was in China？ A. Cai Lun invented paper. B. The Chinese used paper money. C. The Chinese saved paper. 2. When did people in western countries first use paper money？ A. In the 7th century. B. In the 15th century. C. In the 13th century. 3. How many trees should be cut down if you want to make 1，000 tons of paper？ A. 71，000. B. 48，000. C. 17，000. |
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