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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.

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

　　Look at the instructions.

　　－Buses leave the Railway Station, New York City, from 7:00 a. m. and then every half-hour, until 11: 30 p. m. (7 days a week )

　　－Buses leave Brennan Station 20 minutes before and after every hour from 6:20 a. m. to 10:40p. m. (7 days a week)

　　－Evening rush-hours (5:00 p. m. to 7:00 p. m. ) : Buses leave the Railway Station, New York City, every 15 minutes ( Monday － Friday )

　　－Holidays : Buses leave every hour on the hour (正點(diǎn)) , ( Trip time: 30 minutes each way)

　　－All tickets must be bought at Window 12, the Railway Station, New York; or at the Brennan Station Window.

1．At which of the following times does a bus leave New York City for Brennan on Thursday?

[　　]

2．If you want to take a bus in evening rush-hours, you should take the ________ bus in the Railway Station, New York City on Monday .

[　　]

3．Where could a ticket be bought?

[　　]

A．From the bus driver.

B．On the bus.

C．At the window with the above instructions.

D．At a ticket window in the Railway Station, New York City or the Brennan Station.