完形填空
阅读下面短文，掌握其大意，然后从各题所给的选项中，选出一个最佳选项，填在题前括号内。
1970 was the World Conservation(保护)Year. Everyone must know that the world is in danger. 1 is one example of the 2 .At one time there were 1,300 different kinds of trees and flowers in Holland(荷兰),but now only 866 remain(继续存在), 3 have been destroyed by modern man. We are changing the earth, the air and the water, and 4 that grows and lives. If we go on like this , we shall destroy ourselves.
What will happen in the future? Perhaps 5 is more important to ask “What must we do now?” The people who will be living in the world tomorrow are 6 young of today. A lot of them know that conservation is necessary. Many are helping to save 7 .
Now fifteen million young people in many countries are studying 8 and the country around him. In some countries they spend much time as “conservation volunteers.” They plant trees and help to 9 wild birds and animals.
But everyone, 10 young people, must work to save our world.
( )1.A. Here B. It C. He D. There
( )2.A.trouble B. question C. problem D. difficult
( )3.A.some B. others C. the other D. the others
( )4.A.everything B. nothing C. something D. all things
( )5.A.this B. that C. one D. it
( )6.A.a B. an C. / D. the
( )7.A.ourselves B. our world C. our lives D. living things
( )8.A.man B. men C. a man D. the men
( )9.A.find B. protect C. catch D. keep
( )10.A.not only B. except C. also D. together with