完形填空

Trees

    Trees are useful to man in three very important ways: they provide him     51     wood and other products; they give him shade; and they help prevent drought and floods.
    Unfortunately, in many parts of the world, man has not     52     that the third of these services is the most important. In his eagerness（渴望）to draw quick profit from the tress, he has cut them down in large     53    , only to find that with the trees used he has lost the best visitors he had. Tow thousand years ago a rich and powerful country cut down its     54     to build warships, with which to gain itself an empire. It gained the empire but, without its trees, its soil became hard and     55    . When the empire fell to pieces, the home country found itself faced with floods and starvation.
    Even when a government realizes the     56     of a rich supply of trees, it is difficult for it to persuade the     57     to see this. The villager wants wood to     58     his food with; and he can earn money     59     making charcoal（木炭）or selling wood to the townsman. He is usually too lazy or     60    . Careless to plant and look after new trees. So, unless the government has a good     61     of control, or can educate the people, the forests will slowly     62    .
    This does not only     63     that the villagers' sons and grandsons have fewer trees. The results are even more     64    : for where there are trees their roots break the soil up — following the rain to sink in — and also bind the soil, thus preventing the     65     from being washed away easily; but where there are no trees, the rain falls on hard ground and flows away on the surface, causing floods and carrying away with it the top-soil, in which crops grow so well. When all the top-soil is gone, nothing remains but worthless desert.
51. A. with B. on C. at D. in
52. A. hoped B. realized C. promised D. planned
53. A. sense B. things C. prices D. numbers
54. A. bricks B. hills C. trees D. crops
55. A. rich B. poor C. famous D. enough
56. A. practice B. importance C. feeling D. space
57. A. enemy B. hero C. son D. villager
58. A. eat B. sell C. grow D. cook
59. A. by B. to C. beside D. down
60. A. well B. towards C. too D. along
61. A. event B. system C. supply D. figure
62. A. disappear B. grow C. arise D. spread
63. A. mean B. believe C. talk D. understand
64. A. reliable B. useful C. serious D. limited
65. A. floods B. rocks C. villagers D. soil

参考答案：51．A          52．B
53．D         54．C         55．B          56．B
57．D         58．D         59．A          60．C
61．B         62．A         63．A          64．C
65．D