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The preventive measures for forest fires...

    The preventive measures for forest fires include some preemptive(抢先)methods that can help reduce the risks of fires and control their severity and spread, and thus, maintain ecological balance and protect resources. Close monitoring of forest fires caused by natural factors can help prevent their spread to a large extent. To contain forest fires, fire departments usually use water and chemical fire retardants(抑制剂) that can be dropped from planes and helicopters. To control the spread of a wildfire, firefighters usually create a control line by removing all fuel from an area so that the fire cannot travel across it.

Controlled burns are often employed by government authorities to reduce fuel buildup, and clean up the fallen leaves, and thus, prevent the spread of forest fires to a vast area. Regular controlled burns can also help maintain biodiversity(生物多样性), as the smoke and heat produced in the process can facilitate(促进) the growth of seeds of certain plant species. Apart from these, responsible human behavior can help reduce the number of forest fires to a great extent. In fact, we can reduce the number of wildfires dramatically by not leaving behind any source of fire in the forest.

Forest fires can affect climate and weather to a great extent, besides causing severe damage to valuable trees. Wildfires can increase the level of greenhouse gases(water vapor, carbon dioxide, etc), and therefore increase pollution and global warming. However, they are also an important part of the ecosystem, and many plants depend on the heat and smoke generated by wildfires for their growth and reproduction. But large wildfires can cause extensive damage to the ecosystem, which again highlights the importance of effective control and prevention of forest fires.

1.What may be the best title for this passage?

A.Control and Prevention of Forest Fires B.How to Keep Ecological Balance

C.Effects of Forest Fires D.Methods of Fire Spread Control

2.Firefighters get rid of all fuel in all area in order to ____________

A.keep close monitoring of forest fires B.prevent the forest fire from occurring

C.protect the animals there D.stop the wildfire from spreading

3.The government arranges some controlled burns to_______________

A.burn the rubbish and keep the forest clean

B.help keep ecological balance of nature

C.reduce fuel building up and limit forest fires spread.

D.provide reasonable conditions for some plants’ growth.

4.A controlled forest fire may play a positive role because ________________.

A.a new forest will appear soon.

B.it promotes the development of some seeds

C.nature keeps its balance only by wildfires.

D.it makes the trees grow faster than before.

 

1.A 2.D 3.C 4.B 【解析】 本文属于说明文阅读。作者通过这篇文章主要向我们描述了森林火灾预防有助于减少损失,减少火灾风险和控制病情蔓延从而确保生态平衡。森林火灾的危害不言而喻,在可控制中的火灾既有助于控制火灾损失,还有助于保持生物多样性。 1.主旨大意题。根据第一段中The preventive measures for forest fires include some preemptive methods that can help reduce the risks of fires and control their severity and spread, and thus, maintain ecological balance and protect resources.可知森林火灾的预防措施包括采取一些先发制人的措施,减少火灾风险,控制火灾的严重程度和蔓延,从而保持生态平衡,保护资源。结合文章主要从对火灾预防和发生后如何控制两方面做了介绍。故A选项“森林火灾的控制和预防”符合文章标题。故选A。 2.细节理解题。根据第一段中To control the spread of a wildfire, firefighters usually create a control line by removing all fuel from an area so that the fire cannot travel across it.可知为了控制野火的蔓延,消防队员通常会通过移除某一区域的所有燃料来建立一条控制线,这样大火就不会蔓延。由此可知,消防人员清除掉所有的可燃物是为了阻止火势的蔓延。故选D。 3.细节理解题。根据第二段中Controlled burns are often employed by government authorities to reduce fuel buildup, and clean up the fallen leaves, and thus, prevent the spread of forest fires to a vast area.可知政府经常利用控制可燃物来减少可燃物积累,清理落叶,从而防止森林火灾蔓延到广大地区。由此可知,政府安排了一些可控燃烧,以减少可燃物的积累,并限制森林火灾的蔓延。故选C。 4.细节理解题。根据最后一段中However, they are also an important part of the ecosystem, and many plants depend on the heat and smoke generated by wildfires for their growth and reproduction.可知然而,它们也是生态系统的重要组成部分,许多植物依靠野火产生的热量和烟雾来生长和繁殖。由此可知,受控的森林火灾可以起到积极的作用,因为它可以促进一些种子的生长。故选B。
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