In the 13th century． Marco Polo the world known Italian travelled， saw many wonderful things in China． One of the things he discovered was money made of paper． People in the West did not have such kind of money until the I5th century． However ，the Chinese began to use it in the 7th century．

Paper was invented by a Chinese man called Cai Lun almost 2，000years ago． But it was not made in Europe until the year 1100． Four hundred years later， a German discovered that he could make the best paper from trees． After that countries rich in forests， such as Canada ，Sweden， America， Finland became the most important ones in paper making．

Paper can be used in many ways． The common uses include newspapers magazines and books． But do you know that paper can be used for keeping warm？ In Finland． the farmers wear paper boots to keep their feet warm in the snow． And even houses can be insulated（使绝缘）from heat or cold with paper．

However． we have to understand that paper still comes from trees now． If we keep on wasting so much paper， there will not be any trees left on the earth some day in the near future． Every day people throw away about 2， 800tons of paper in our city． It takes 17trees to make one ton of paper． This means that we are cutting down nearly 48.000trees every day． The fact is that it takes more than 10years for a tree to grow．

So we must start saving paper right now． We can use both sides of every piece of paper． We can make useful things out of used paper． We can use china cups instead of paper ones． When shopping， we can use fewer paper bags and reuse them if we have some

In short， we should keep a balance （平衡）between using paper and protecting trees， and do it now before it is too late．

（1）When did the Chinese begin to use paper money 　　？

A．	In the 5th century
B．	In the 6th century
C．	In the 7ih century
D．	In the 15th century

（2）Why did Canada become an important country in paper making 　　？

A．	Because it was a large country
B．	Because it had lots of forests
C．	Because it was a very rich country
D．	Because the inventor was from Canada

（3）In Finland． paper is used for 　　．

A．	making beds
B．	reducing waste
C．	making umbrellas
D．	keeping warm

（4）According to the passage． how many trees are needed to make one ton of paper 　　？

A．	10
B．	17．
C．	2，800
D．	48，000

（5）Paragraph 5 mainly talks about 　　

A．	how paper boots are made
B．	how paper was invented
C．	how we can save paper
D．	how we can make useful things