In the 13th century, Marco Polo travelled a long way to China. He was a famous Italian 31 During his stay in China, he saw many wonderful things. One of the things he 32 was that the Chinese used paper money. People in 33 coun­tries didn’t use paper money until the 17th century. However,people in China began to use paper money in the 10th century. 34 was invented by a Chinese about 2 000 years ago. His name was Cai Lun. He then 35 these pieces of paper together and made them into a 36 . Now paper mainly comes from trees. We use it every day. 37 we waste a lot of it. If we keep on doing so, people 38 cut down many more trees. Then there will not be any trees left. If there are no 39 , there will be no paper. So how can we 40 paper? When we mak­ing notes,we can use 41 sides of each piece of paper. We  can  buy  drinks  in bottles instead of 42 in paper packets. We can also use cotton handkerchiefs ( 棉手帕) and not the paper ones. 43 we go shopping, we can use fewer paper bags. If the salesman gives us a paper bag, we can keep it and 44 it later. We can help to protect trees if we think 45 . We should to it now,before it is too late. 小题1: A．traveller B．actor C．doctor D．driver 小题2: A．disliked B．disagreed C．invented D．discovered 小题3: A．Eastern B．Western C．Southern D．Northern 小题4: A．Iron B．Paper C．Television D．Silk 小题5: A．collected B．divided C．moved D．put 小题6: A．magazine B．newspaper C．book D．dictionary 小题7: A．Sometime B．Some time C．Sometimes D．Some times 小题8: A．have to B．mustn’t C．used to D．shouldn’t 小题9: A. books         B. trees           C, leaves        D. factories 小题10: A．make B．use C．save D．buy 小题11: A．all B．each C．every D．both 小题12: A．them B．those C．these D．ones 小题13: A．Before B．After C．As soon as D．When 小题14: A．repair B．record C．reuse D．return 小题15: A．carefully B．badly C．quickly D．freely