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In the 13th century，Marco Polo travelled a long way to China．He was a famous Italian __1  ．During his stay in China，lie saw many wonderful things．One of the things he  2   was that the Chinese used paper money．People in   3    countries didn't use paper money until the 17th century．However，people in China began to use paper money in the 10th century．

__4   was invented by a Chinese about 2,000 years ago．His name was Cai Lun．He then __5   these pieces of paper together and made them into a   6   ．

Now paper mainly comes from trees．We use it every day．  7   we waste a lot of it．If we keep on doing so，people   8   cut down many more trees．Then there will not be any trees left．If there are no   9  ，there will be no paper．

So how can we   10   paper? When we are making notes，we can use   11   sides of every piece of paper．We can buy drinks in bottles instead of   12   in paper packets．We can also use cotton handkerchiefs（棉手帕）and not the paper ones．  13   we go shopping，we can use fewer paper bags．If the salesman gives us a paper bag，we can keep it and   14   it later．

We can help to protect trees if we think   15  ．We should do it now, before it is too late．

1．A．traveller                 B．a(chǎn)ctor                   C．doctor                   D．driver

2．A．disliked                  B．disagreed             C．invented                 D．discovered

3．A．Eastern                  B．Western               C．Southern                D．Northern

4．A．Iron                      B．Paper                   C．Television              D．Silk

5．A．collected                B．divided                 C．moved                   D．put

6．A．magazine               B．newspaper                  C．book                      D．dictionary

7．A．Sometime              B．Some time            C．Sometimes             D．Some times

8．A．have to                  B．mustn't                C．used to                  D．shouldn't

9．A．books                    B．trees                    C．leaves                    D．factories

10．A．make                   B．use                      C．save                             D．buy

11．A．a(chǎn)ll                       B．each                    C．every                     D．both

12．A．them                   B．those                   C．these                     D．ones

13．A．Before                 B．After                   C．As soon as           D．When

14．A．repair                  B．record                 C．reuse                     D．return

15．A．carefully              B．badly                   C．quickly                  D．freely