Cracking the Toefl IBT 2009 edition part 54

Ngoài ra, các đĩa CD audio bao gồm các mẫu của các loại hội thoại và bài giảng mà bạn sẽ nghe trong bài thi để cung cấp cho bạn một ý tưởng tốt về những gì mong đợi và giúp bạn phát triển kỹ năng lắng nghe của bạn. | TOEFL Writing Wilderness management has advanced greatly over the last century due in part to such practices as the suppression of forest fires and limitations on the clear-cutting of trees. Monitoring forests for small brushfires is easier with aircraft as is the use of large amounts of water and sophisticated chemical fire extinguishers to prevent fires from spreading. The goals of decreasing the amount of destruction by fires and cutting are wide- ranging. One is simply the longer lives and improved health of trees. In some areas of hickory and oak forest on the Eastern Seaboard fire suppression has allowed the maturation of so many trees that the treetops form a continuous canopy. There is evidence of the healthful effects of fire suppression closer to the ground as well. Vines and low bushes that would be burned out in a forest fire can flourish when fires are suppressed of course but there is a more indirect way fires harm plant life. Chemical tests on areas that have recently experienced forest fires demonstrate that burning decreases the overall amount of nutrients in the soil. Suppressing fires prevents such a decrease. Ferns wildflowers and herbs grow without disturbance. Finally wildlife can benefit. In the eastern hickory and oak forests the suppression of fires has meant that forest animals ranging from small insects and birds to large deer and bears are not burned to death. Deer populations in particular have increased notably. 548 I Cracking the TOEFL iBT Restart audio CD. Narrator Now listen to part of a lecture on the topic you just read about. The Princeion Review TOEFL iBT Practice Test I 549 550 I Cracking the TOEFL .

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