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
外语
Few natural dangers are more feared than avalanches. Avalanches are a familiar part of European history. Particularly in the Swi
Few natural dangers are more feared than avalanches. Avalanches are a familiar part of European history. Particularly in the Swi
admin
2014-01-13
80
问题
Few natural dangers are more feared than avalanches. Avalanches are a familiar part of European history. Particularly in the Swiss and French Alps. This is where the direction of wars has turned almost instantly because of avalanches wiping out invading armies.
In North America, avalanches are limited almost entirely to the Rocky Mountains and the lower ranges to the west, the Sierra Nevadas and the Cascades. Avalanches have occurred in the mountains of New England but not with the regularity and intensity seen in the western mountains.
Several methods are used in explaining and predicting avalanches. Scientists are learning about them using research methods. So many of the factors that create avalanches are hidden beneath the snow’s surface that predictions are still largely guesswork. Therefore, winter travelers must assume the worst of conditions when they traverse the slopes.
An avalanche occurs when a given amount of snow becomes too heavy for whatever is holding it in place. It then breaks loose and slides downhill.
Avalanches are divided into two general categories, loose snow and slab. A loose snow avalanche usually starts at a single point, such as a skier’s track, and spreads out like a fan or a pyramid in a chain reaction. One crystal breaks another free, which multiples as the loose snow moves downhill.
Sometimes these avalanches stop after only a few feet. Sometimes they move thousands of tons of snow downhill in speeds up to 300 miles per hour. This creates a shock wave that can flatten parts of a forest that are not even touched by the actual avalanche.
Stab avalanches are those that have a wide area of snow which breaks loose in a large piece. These can range in size from just a few square feel to thousands of square feet of snow. The most dangerous and common type of avalanche for skiers is the so-called "soft slab" avalanche. This type occurs most often during, or just after a heavy snowfall. The snow hasn’t yet had a chance to settle and adhere to the existing snow. The heavier and the wetter the snow and the colder the temperature, the less likely the new snow will form a bond with the existing snow.
What would be the best title for this passage?
选项
A、Avalanches
B、The History of Avalanches
C、Skiers Beware
D、Avalanches Can Kill
答案
A
解析
主旨题。全文主要介绍“雪崩是恐怖的自然灾害”和“雪崩的发生和类型”。故答案为A。
转载请注明原文地址:https://kaotiyun.com/show/M1QO777K
0
考博英语
相关试题推荐
Inpromisingtofusemediaasdiverseastelevision,telephonecommunication,videogames,musicanddatatransmission,theera
TheSolarDecathlonisunderway,andteamsofstudentsfrom14collegesanduniversitiesarebuildingsolar-poweredhomesonth
Ahundredyearsagoitwasassumedandscientifically"proved"byeconomiststhatthelawsofsocietymakeitnecessarytohave
Thebusinessofadvertisingistoinventmethodsofaddressingmassiveaudiencesinalanguagedesignedtobeeasilyaccessible
Drunkendriving-sometimescalledAmerica’ssociallyacceptedformofmurder-hasbecomeanationalepidemic(流行病).Everyhour
Inacompetitiveeconomy,theconsumerusuallyhasthechoiceofseveraldifferentbrandsofthesameproducts.Underneaththeir
Forover30years,DonaldKroodsmahasworkedtodisclosesuchmysteriesofbirdcommunication.Throughfieldstudiesandlabora
Amongpicturebooksfor4-8yearsolds,severaloutstandingworksappearedthatcombinedoriginalstorieswith______illustration
Theremarkable______oflifeontheGalopagosIslandsinspiredCharlesDarwintoestablishhistheoryofevolution.
Hereisagreatironyof21st-centuryglobalpublichealth;Whilemanyhundredsofmillionsofpeoplelackadequatefoodasare
随机试题
我国的标准体系分为()个级别。
某患者尿比重低且固定于1.010。诊断应考虑
患者,女,50岁。慢性咳喘10年.近3年加重,常伴心悸怔忡,气不足以息。3天前因受风寒引发咳逆痰多,喘息不得卧.一身面目浮肿,舌暗胖,苔白腻略黄。治疗宜选用
患者,男性,81岁。脑动脉硬化,医嘱服用阿司匹林。该药物治疗的原理是
某试验室在进行沥青混合料配合比设计时,发现空隙率和饱和度均能满足规范要求,但目测混合料干涩,沥青用量明显偏小,甚至有花白料。请分析原因,同时应如何进行调整?
通过财政分配活动来减少和抑制社会总需求,称为()财政政策。
由于基金管理人负责基金的资金管理与应用,因此,基金投资发生的亏损应由基金管理人独立承担。()
下列可以作为抵押财产的是()。
行政机关实施行政处罚,有下列哪些情形的,由上级行政机关或者有关部门责令改正,可以对直接负责的主管人员和其他直接责任人员依法给予行政处分。()
[*]
最新回复
(
0
)