The year 1970 was World Conservation (保护)Year. Everyone must know that the world is in 51 . Here is one example of the problem. At one time there was 1300 different kinds of trees and flowers in Holland(荷兰), 52 only 866 remains(继续存在). The others have been destroyed by modern man. We are  53  the earth, the air and the water, and everything that grows and lives. If we go on like this, we shall destroy  54 .

What will happen in the future? Perhaps it is more  55  to ask “ what must we do now?” The people  56  will be living in the world tomorrow are the young of today. A lot of them know that conservation is necessary. 57  are helping to save our world. Now fifteen million young people in many countries are paying attention to the relationship(关系) between man and the country  58  them. In some countries they  59  much time as “conservation volunteers”. They plant trees and help to  60  wild birds and animals.

But everyone, not only young people, must work to save our world.

51.(   )A. safety     B. difficulty    C. beauty     D. danger

52.(   )A. but     B. just       C. or      D. and

53.(   )A. making    B. building    C. changing    D. cleaning

54.(   )A. itself     B. us       C. themselves   D. ourselves

55.(   )A. interesting   B. difficult    C. dangerous    D. important

56.(   )A. whom     B. who      C. whose     D. what

57.(   )A. Much     B. A few     C. Many     D. A little

58.(   )A. with     B. about     C. around    D. among

59.(   )A. take      B. cost     C. spend     D. have

60.(   )A. stop      B. protect    C. catch     D. keep

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