All over the world，forests are safeguarding the health of the planet itself. They do this 1 protecting the soil, providing water and 2 the climate. Trees 3 soil to mountainsides. Hills 4 the trees have been felled lose 500 times as 5 soil a year as those with trees.

Trees catdb and 6 rainwater. Their leaves break the impact 7 the rains, roKhing them of 8

destructive poiger. The roots of trees allow the water t0 go into the soil, 9 gradually releases it to flow down

rivers and Tefill gp&tttid-water reserves. 10 there are no trees, the raiiw run in sheets of smter off the land,

11 the soil with them. Land 12 with trees and other plants 13 20 times more rainwater than 14

earth. As they grow, trees absorb carbon dioxide, the main 15 of the ‘‘greenhouse effect”，which 16

irreversibly to change the world’ s climate. Together，the world’ s trees，plants and soils contain three times 17

much carbon as there is in the atmosphere.

The world ’ s forests contain the vast majority of 18 animal and plant species. The tropical rainforests

19have well overhalf of them，20 theycover only about 6% of the Earth*s land surface.

1.A.forB.formC.byD.with

2.A.adoptingB.regulatingC.transformingD.controlling

3.A.bindB.requirec.giveD.offer

4.A.thatB.whichc.whereD.there

5.A.lessB.morec.manyD.much

6.A.storeB.transmitc.attractD.catch

7.A.onB.withc.ofD.for

8.A.itsB.thesec.thoseD.their

9.A.thatB.itc.whatD.which

10AWhenB.Wherec.WhileD.Although

11. A.bringingB.carryingC. takingD.missing

12. A.coveredB.occupiedC. settledD.fixed

13. A.absorbsB.reducesC. engagesD.provides

14. A.plainB.emptyC. bareD.simple

15. A.reasonB.effectC. purposeD.cause

16. A.warnsB.attemptsC. threatensD.approaches

17. A.asB.moreC. thatD.so

18. A.itsB.theirC. theseD.those

19. A.onlyB.lonelyC. aloneD.itself

20. A.no matterB.in spiteC. in thatD.even though

参考答案

参考答案

1-5、CBACD6-10、ACDDB11-15、BAACD16-20、CAACD