首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
专升本
People often speak of fire as though it were a living creature—It grows, dances, needs oxygen, feeds on whatever it can find, an
People often speak of fire as though it were a living creature—It grows, dances, needs oxygen, feeds on whatever it can find, an
admin
2013-12-10
22
问题
People often speak of fire as though it were a living creature—It grows, dances, needs oxygen, feeds on whatever it can find, and then dies. And when a forest fire rages out of control, threatening human lives and homes, it must be fought like a "wild animal. " The fight is often desperate, since firefighters’ best efforts may be dwarfed by the fury of a large fire. But the fire’s own traits can be used against it.
The heated air above a fire rises in a pillar of smoke and burnt gases, pulling fresh air in from the sides to replace it. Firefighters use this fact when they "fight fire with fire. " They start a fire well in front of the one which they are fighting. Instead of traveling on in front of the huge fire, the smaller fire is pulled back toward it by the updrafts of the larger blaze. As it travels back to meet the large fire, the smaller backfire burns away the fuel that the forest fire needs to survive.
Even when a backfire has been well set, however, the fire may still win the struggle. The wind which the firefighters used to help them may now become their enemy. When the backfire meets the main fire, before both die for lack of fuel, there is tremendous flame, great heat and wild winds. A strong gust may blow the fire into the treetops beyond the area, giving the fire new fuel and a new life.
A backfire is started______.
选项
A、behind a forest fire
B、ahead of a forest fire
C、on the sides of a forest fire
D、all around a forest fire
答案
B
解析
第二段。In front of the huge fire表明在森林大火的前面。选项B是正确的。
转载请注明原文地址:https://kaotiyun.com/show/csYC777K
本试题收录于:
英语题库成考专升本分类
0
英语
成考专升本
相关试题推荐
Electronicbookscouldrevolutionizereading,butpeopleoughttoconsidertheirfar-reachingimpactsaswell."Thee-bookpromi
Haveyou【61】askedyourselfwhychildrengotoschool?Youwillprobablesaythattheygo【62】theirownlanguageandotherlanguag
Studentswillneed【21】alloftheirlanguageskillsinordertounderstandthereadingselectionsinReader’sChoice.Thebookco
OneoftheindustrialgiantswhochangedAmericansocietywasHenryFordbornonafarminMichiganin1863,andhegrewuptob
Wecanmakemistakesatanyage.Somemistakeswemakeareaboutmoney.Butmostmistakesareaboutpeople."DidJerryreallyca
Youmaygoearlierifyoureallyhaveto,butI’dratheryou______forme.
Eversincehumanshaveliveontheearth,theyhavemadeuseofvariousformsofcommunication.Generally,thisexpressionofth
Evenplantscanrunafever,especiallywhenthey’reunderattackbyinsectsordisease.Butunlikehumans,plantscanhavethei
Mart’sstoryinChinabeganmanythousandsofyearsago.RemainsofanearlyformofmandiscoveredinChina,knownasPekingMa
Althoughtheremaybethousandsofdifferentkindsofjobs,asIseeittherearebasicallyonlytwokindsofwork.Oneisthes
随机试题
设函数,则f(x)在点x=0满足[].
胃癌患者手术中发现其卵巢上有癌结节,以下最可能的是()
A、清热解毒,排脓消痈B、清热解毒,祛痰利咽C、清热解毒,凉血止痢D、清热解毒,祛风燥湿E、清热解毒,活血止痛白鲜皮的功效为
时期指标是反映社会经济现象总体在一段时期内发展过程的总量。其特点是()。
商业性农业保险实行()原则。
租赁方式进口的货物中,以租金方式对外支付的租赁货物,在租赁期间作为完税价格的是()。
【资料】一年级的赵老师发现珍妮是个总爱低着头、很忧郁的小女孩,因为她一直觉得自己长得不够漂亮。赵老师想了个办法。一天,赵老师带她到饰品店去买了只红色的蝴蝶结,店主不断赞美她戴上蝴蝶结挺漂亮,珍妮虽不信,但还是挺高兴,不由得昂起了头,急于让大家看看。赵老师也
向上级机关行文,应当遵循的规则有()。
给定资料1.中央政法工作会议2015年1月20日在京召开。中共中央总书记、国家主席、中央军委主席习近平近日就政法工作作出重要指示强调,新形势下,政法机关任务更重,人民群众要求更高。希望全国政法机关主动适应新形势,增强工作前瞻性,有效防控各类风险,
最优二叉树(或哈夫曼树)是指权值为w1,w2,…,wn的n个叶结点的二叉树中带权路径长度最小的二叉树。__________是哈夫曼树(叶结点中的数字为其权值)。
最新回复
(
0
)