Trees are useful to man in three important ways: They provide him with wood and other products; they provide him shade;. and they help to prevent droughts（早灾）and floods.

    Unfortunately, in many parts of the world, man has not realized that the third of these services is the most important．In his eagerness to make money from trees, he has cut them down in large numbers, only to find that without them he has lost the best friends he had. And besides, he is usually too careless to plant and look after new trees. So the forests slowly disappear.

    This does not only mean that man will have fewer trees. The results are even more serious: for where there are trees, their roots break up soil allowing the rain to sink in and also bind（固定）the soil, thus preventing it from being washed away easily；but where there are no trees, the rain falls on hard ground and flows away, causing floods and carrying away the rich top-soil. When the top-soil is gone, nothing remains but worthless desert.

    Two thousand years ago，a rich and powerful country cut down its trees to build warships, with which to gain itself an empire(帝国）．It set up the empire, but, without its trees, its soil became poor and grew weak. When the empire fell to pieces, the home country found itself faced by floods and starvation（饥荒）．

1.The most important service of trees to man is that___________．

   A. they give them wood and other products      B. they give them shade

   C. they help him prevent droughts and floods    D. they help him made money

2.In many parts of the world, forests slowly disappear because___________．

   A. many trees have been cut down by man    B. man has not paid enough attention to planting trees

   C. new trees are not looked after properly     D. all the above

3.Land becomes desert after all trees are cut down because____________．

   A. roots of trees break up the soil              B. there are too many rainfalls

   C. there are no larger trees to keep rain and protect the top-soil   D. strong winds bring a lot of sand

4.The country mentioned in the passage suffered from floods and starvation  because________.

   A. it set up an empire             B. the empire fell to pieces

   C. it built too many warships       D. it lost its trees

5.Which title best fits the passage?

   A. Trees and Man               B. How Trees Prevent Droughts and Floods

   C. How an Empire Fell          D. A Story about Trees.

One day a famous speaker gave a speech to a crowd of people. He held up a   36   bill. He asked, “Who would like this $20 bill ? ” Hands were   37   . Then he said, “I am going to give this $20 to one of you, but first let me do this.” He began to crumple（弄皱）the   38  . He then asked the audience, “   39   still wants it ?” Still the hands went   40  in the air.

  “ What   41   I do this? ” He asked, and he   42   it on the ground, and started to step on it. He   43   it up. Now the bill was   44   and crumpled. “ Now who still wants it?” Still the hands went up.

  “My friends,” He continued, “You have all   45    a good lesson . No matter   46   I did to the money, you still wanted it because the bill did not lose its   47   . It was still worth $20. Many times in our   48  , we are dropped, crumpled, and stepped on, because we sometimes  49   wrong decisions, or we may   50   with something we do not   51  .When that happens, we feel depressed and think we are   52  . But in fact no matter what has happened or what will happen, you will never lose your value. The worth of our life comes not   53   what we do or whom we know, but in who we are! Don’t forget ‘the worth of a thing does not depend on its outside   54   , but on its inner value.’ This is the   55   of life.

A. 20 dollar         B. 20 dollars              C. 20-dollars      D. 20-dollar.

A. risen         B. put                C. raised               D. held

A. bill          B. paper               C. cash                      D. change

A. Somebody    B. Nobody             C. Anybody      D. You

A. up           B. down                C. above              D. around

A. should          B. can                 C. if            D. whether

A. threw           B. dropped             C. fell                D. put

A. showed         B. lifted                C. brought           D. picked

A. good            B. clean                C. large               D. dirty

A. given           B. learned              C. taught              D. taken

A. that              B. how                 C. what                D. why

A. value           B. price                C. effect              D. part

A. studies          B. work               C. fields               D. lives

A. do              B. make                C. give                       D. take

A. meet            B. deal                 C. talk                 D. get

A. like             B. hope                C. wish                D. expect

A. worthless      B. weak                C. poor                D. careless

A. from            B. in                  C. about               D. at

A. beauty          B. face                 C. looks              D. impression

A. lesson           B. truth                C. saying            D. story

One day a famous speaker gave a speech to a crowd of people. He held up a   36   bill. He asked, “Who would like this $20 bill ? ” Hands were   37   . Then he said, “I am going to give this $20 to one of you, but first let me do this.” He began to crumple（弄皱）the   38  . He then asked the audience, “   39   still wants it ?” Still the hands went   40  in the air.

  “ What   41   I do this? ” He asked, and he   42   it on the ground, and started to step on it. He   43   it up. Now the bill was   44   and crumpled. “ Now who still wants it?” Still the hands went up.

  “My friends,” He continued, “You have all   45    a good lesson . No matter   46   I did to the money, you still wanted it because the bill did not lose its   47   . It was still worth $20. Many times in our   48  , we are dropped, crumpled, and stepped on, because we sometimes  49   wrong decisions, or we may   50   with something we do not   51  .When that happens, we feel depressed and think we are   52  . But in fact no matter what has happened or what will happen, you will never lose your value. The worth of our life comes not   53   what we do or whom we know, but in who we are! Don’t forget ‘the worth of a thing does not depend on its outside   54   , but on its inner value.’ This is the   55   of life.

1.A. 20 dollar        B. 20 dollars              C. 20-dollars      D. 20-dollar.

2.A. risen         B. put                C. raised               D. held

3.A. bill          B. paper               C. cash                      D. change

4.A. Somebody    B. Nobody            C. Anybody      D. You

5.A. up           B. down                C. above              D. around

6.A. should          B. can                 C. if            D. whether

7.A. threw           B. dropped             C. fell                D. put

8.A. showed         B. lifted                C. brought           D. picked

9.A. good            B. clean                C. large               D. dirty

10.A. given                B. learned              C. taught              D. taken

11.A. that            B. how                 C. what                D. why

12.A. value         B. price                C. effect              D. part

13.A. studies               B. work               C. fields               D. lives

14.A. do                   B. make                C. give                       D. take

15.A. meet                 B. deal                 C. talk                 D. get

16.A. like                  B. hope                C. wish                D. expect

17.A. worthless    B. weak                C. poor                D. careless

18.A. from                 B. in                  C. about               D. at

19.A. beauty        B. face                 C. looks              D. impression

20.A. lesson                B. truth                C. saying            D. story