21、In 1620, about half the USA was covered by forests．Today the forests have almost gone．A lot of good land has gone with them, leaving only sand．China doesn't want to copy the USA's example．We're planting more and more trees．We've built the " Great Green Wall" of trees across northern part of our country．The Great Green Wall is 7,000 kilometers long, and between 400 and 1,700 kilometers wide．It will stop the wind from blowing the earth away．It will stop the sand from moving towards the rich farmland in the south． More "Great Green Walls" are needed．Trees must be grown all over the world． Great Green Walls will make the world better．

1．In 1620, about ______ the USA was covered by forests．

A．a third          B．half              C．two thirds                  D．a fourth

2．A lot of good land has gone with ______．

A．sand           B．water            C．wind                D．forests

3．The Great Green Wall in China is ______ long．

A．7,000 kilometers                             B．1,700 kilometers

C．7,000 meters                              D．400 kilometers

4．Trees must be grown in ______.

A．China      B．the USA     C．some countries    D．every part of the world

20、The students were having their chemistry（化学）class. Miss Li was telling the children what water was like. After that, she asked her students, “What’s water?”No one spoke for a few minutes．Miss Li asked again，“Why don’t you answer my question？Didn’t I tell you what water is like？”

Just then a boy put up his hand and said，“Miss Li，you told us that water has no colour and no smell．But where to find such kind of water？The water in the river behind my house is always black and it has a bad smell．”Most of the children agreed With him．

“I’m sorry，children．”said the teacher，“Our water is getting dirtier and dirtier．That’s a problem．

1．The students were having their _______ class．

A．English          B．Chinese        C．chemistry       D．maths

2．Miss Li was telling the children what ______ was like．

A．water          B．air             C．earth           D．weather

3．A boy said，“The water in the river behind my house is always _______．”

A．white           B．black           C．clean           D．clear

4．Most of the children _______ the boy．

A．agreed with    B．wrote to         C．heard from   D．sent for

19、John sent for a doctor because his wife was ill．He called the doctor and made sure they would meet at five．He arrived at the doctor's at twenty to five．He thought, "It's a little bit earlier．I'll wait for a moment． It's good to keep the time．"

Then he stopped his car in front of the doctor's． He looked around and saw a noisy square（广场）not far from here． He went there and sat down on a chair to enjoy the last light of afternoon sun and make himself quiet．He saw some children playing and some women talking to each other happily．

Suddenly he heard a girl crying．He came up to her and asked some questions．Then he knew she got lost．John tried to find out her address and took her home．The girl's parents were very thankful．

Then John hurried to the doctor's．The doctor said angrily when he saw him, "You're late．Why did you keep me waiting for twenty minutes? " John said nothing but one word—"Sorry! "

1．John went to the square to ______．

A．spend the time                                    B．enjoy himself

C．see the children and the women           D．help the girl

2．The girl cried because ______．

A．someone hit her                                   B．she fell off her bike

C．her parents were angry with her              D．she didn't find the way home

3．At last John got to the doctor's at ______．

A．twenty to five                                     B．twenty past five

C．five o'clock                                        D．forty past five

17、Mr. West was born in a small town in England. His father had a   1   there. The shopkeeper didn’t think it was   2   for his son to go to school. So he taught him how to get more money. They got much money there and then    3    to the city. Later on, old West couldn’t manage his shop and Mr. West had to do it instead of him. As he had little knowledge, he was often   4   in public and sometimes he got into trouble. So he   5   a lot of books and shelves and placed them in his sitting room   6   the visitors could see them as soon as they went in. He often went to the parties and carefully listened to what other men said. He hoped to make friends with them. Once Mr. West was told that it was   7   writer’s birthday that day. He hurried there with his wife. He gave the writer some expensive presents and the old man thanked him very much. After   4   they began to talk about the literary works. He could hardly answer any questions. The writer had to ask him   9  one, “What was Shakespeare?” 

“It was a kind of drink”, answered Mr. West. But people do not like it now. The writer had a smile and soon he stopped   10   with Mr. West. On their way home, Mr. West’s wife said, “You made a mistake just now, Shakespeare is a delicious cake, like the Chinese moon cake!”

1．A．factory            B．cinema                    C．shop                D．park

2．A．useful             B．possible                  C．easy                D．different

3．A．went               B．got                         C．ran                  D．moved

4．A．laughed at       B．helped                     C．hurt                 D．beaten

5．A．borrowed        B．found                  C．bought             D．wrote

6．A．because          B．so that                    C．though             D．if

7．A．strange            B．kind                        C．famous            D．foreign

8．A．class              B．school                    C．meeting           D．dinner

9．A．more different    B．the most different    C．easier                     D．the easiest

10．A．to talk           B．talking                    C．to answer        D．answering

16、从方框A~G中选出可以填入对话空白处的最佳选项。选项中有两项为多余选项。

Mr. Black and his wife are talking about shopping．（M ：Mr. Black W ：Mrs. Black）

W：   1   

M：Shopping is always boring（烦人的）．

W：Yes．But without you I can't decide what to buy．  2     I need your help．

M：Last Sunday we spent a whole day shopping，but came back with nothing．

W：  3     Sometimes I really don't know what to buy．

M：I'm really afraid to hear you say，“   4    ”

W：Don't laugh at me，please．

M：I think you'd better go by yourself this time．5   

15、The only thing ______we could do was to ask the police for help.

A．which             B．who          C．that           D．whom

14、--What do you think of the watch?

-- _______.

A．I like it very much                     B．I like it, too

C．With pleasure                         D．It looks nice

13、She said there was going to _____ a football match tomorrow.

A．have          B．has         C．be            D．hold

12、Li Lei knew little about the film _____ he saw it yesterday afternoon.

A．if           B．since         C．until           D．because