In the 13th century, a famous Italian traveler, Marco Polo, traveled a long way to China.<br />During his stay in China, he saw many wonderful things.<br />One of the things he discovered was that the Chinese used paper money.<br />In western countries, people did not use paper money until the 15th century.<br />However, people in China began to use paper money in the 7th century.<br />A Chinese man called Tsai Lun invented paper almost 2,000 years ago.<br />He made it from wood.<br />He took the wood from trees and made it into paper.<br />He then put these pieces of paper together and made them into a book.<br />Now paper still comes from trees.<br />We use a lot of paper every day.<br />If we keep on wasting so much paper, there will not be any trees left on the earth.<br />If there are no trees, there will be no paper.<br />It is reported that people throw away about 2,800 tons of paper only in Shanghai every day.<br />It takes 17 trees to make one ton of paper.<br />This means that they are cutting nearly 48,000 trees every day.<br />Since it takes more than 10 years for a tree to grow, we must start using less paper now.<br />If we don't, we will not have enough time to grow more trees to take the place of those we use for paper.<br />In the 13th century, a famous Italian traveler, Marco Polo, traveled a long way to China.<br />During his stay in China, he saw many wonderful things.<br />One of the things he discovered was that the Chinese used paper money.<br />In western countries, people did not use paper money until the 15th century.<br />However, people in China began to use paper money in the 7th century.<br />A Chinese man called Tsai Lun invented paper almost 2,000 years ago.<br />He made it from wood.<br />He took the wood from trees and made it into paper.<br />He then put these pieces of paper together and made them into a book.<br />Now paper still comes from trees.<br />We use a lot of paper every day.<br />If we keep on wasting so much paper, there will not be any trees left on the earth.<br />If there are no trees, there will be no paper.<br />It is reported that people throw away about 2,800 tons of paper only in Shanghai every day.<br />It takes 17 trees to make one ton of paper.<br />This means that they are cutting nearly 48,000 trees every day.<br />Since it takes more than 10 years for a tree to grow, we must start using less paper now.<br />If we don't, we will not have enough time to grow more trees to take the place of those we use for paper.
（1）
What did Marco Polo see when he was in China?
A . The Chinese invented paper.B . The Chinese used paper money.C . The Chinese planted trees for paper.
（2）
When did people in western countries first use paper money?
A . In the 7th century.B . In the 13th century.C . In the 15th century.
（3）
How many trees should be cut down to make one ton of paper?
