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、CBACD 6-10、ACDDB 11-15、BAACD 16-20、CAACD
