| 完形填空。 | ||||
| The famous Italian traveler, Marco Polo, travelled a long way to China in 1 century. He saw many interesting things in China. One of 2 things he found was that the Chinese people used paper money. In 3 countries, people didn't use paper money 4 the seventeenth century. But people in China began to use paper money in the eleventh century. A Chinese man called Cai Lun invented paper almost 2,000 years ago. He made it from wood. He took the wood from trees and made it 5 paper.He then put them together, and made them into a 6 . Now we know 7 comes from trees, and we must save paper. We use a lot of paper every day. If we always waste paper, there will be no paper, because there are not so many trees 8 us to make paper from.Everyone must help to 9 paper. If we all think carefully, we can help to grow 10 trees. And we should do it now, before it is too late. | ||||
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