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
Scientists have begun using satellite-based systems to predict volcanic eruptions. This allows blanket coverage of the entire wo
Scientists have begun using satellite-based systems to predict volcanic eruptions. This allows blanket coverage of the entire wo
admin
2022-01-18
59
问题
Scientists have begun using satellite-based systems to predict volcanic eruptions. This allows blanket coverage of the entire world. Envisat is the most advanced craft of this type. It has sensors that, by recognizing the characteristic optical signature of various substances in the atmosphere, can detect the presence of specific gases, such as sulphur dioxide (二氧化硫). These may indicate an imminent (即将来临的) volcanic eruption.
Mike Abrams, a scientist at America’s space agency, NASA, says that the limiting factor on all such satellites is, surprisingly, not technological, but temporal. The orbits in which they are placed allow them to observe the entire earth, but they cannot pass over a particular spot more frequently than once every 15 days or so. Dr. Abrams argues that more satellites are needed to gather sufficient data on the earth’s volcanoes. Existing satellites, though, do at least serve as an early warning system. If one of them detects something amiss, local volcanologists can then intensify their local monitoring efforts. If necessary, they can even initiate an evacuation.
In addition, it is important to predict lahars (火山泥流) , flowing mixtures of rock, debris, ash and water, which are often set off when hot lava meets cold snow. Lahars can travel down a mountain as fast as 60 kilometres per hour. In 1985 a lahar set off by the eruption of the Nevada del Ruiz volcano in Colombia killed 25,000 people. With acoustic flow monitors, such as those developed by the USGS in the last five years, such a tragic loss of life might have been averted. The flow monitors are seismometers (地震检波器), which measure vibration, and are sensitive to higher frequencies than those often used to record earthquakes and volcanic activity. This lets them hear lahars from a long way off, creating a valuable extra hour of time that can be used to evacuate. Such systems are now in place all round the world.
Volcanic eruptions are dangerous not only to people on the ground, but also to those in the air.
According to the USGS, more than 80 commercial aircraft have run into unexpected volcanic ash in the past 15 years, with the resulting damage costing hundreds of millions of dollars. If the optimists are right, the threat from volcanoes could one day become a known one. There is a problem, though. The work that needs to be done relies on the continual use of satellites and ground monitoring. Volcanologists are now issuing a new warning: it is particularly hard to get funding for this kind of work. This is something that everybody should be bothered about.
What is the author’s attitude towards the prospect of volcanic eruption predictions?
选项
A、Optimistic.
B、Bothered.
C、Skeptical.
D、Regretful.
答案
C
解析
由题干中的author’s attitude towards the prospect of volcanic eruption predictions定位至第四段最后两句。观点态度题。定位句指出“这项工作获得资助尤为困难。这是每个人都应担忧的问题。”这说明,作者对预测火山爆发的前景颇为担忧,故答案为C)。
转载请注明原文地址:https://kaotiyun.com/show/hjx7777K
0
大学英语六级
相关试题推荐
A、Thepossibilityofruiningherfamily.B、Becomingawareofherdeclininghealth.C、Thefatiguefromlivingafast-pacedlife.
AIisprobablycomingforyourjob.Buttheremaybeawaytofuture-proofyourcareer."Humansaregoingtofindmeaningfulwor
在大家庭(extendedfamily)里,老一辈人的意见受到尊重,小一辈的人得到全家的爱护。中国宪法(constitution)规定赡养父母是成年子女义不容辞的责任。在城市里,不和家里老人一起住的年轻夫妇给老人生活费(livingexpenses
DoestheInternetMakeYouDumber?A)TheRomanphilosopherSenecamayhaveputitbest2,000yearsago:"Tobeeverywhe
A、Eatingmoresaltmeansmoreheartattacks.B、Lesssaltissureofreducingmanyheart-relateddiseases.C、Eatinglesssaltmay
A、Parents.B、Children.C、Payscales.D、Managementsystems.C
A、Theyhavebadrelationshipwithothers.B、Theygooutforawalktoofrequently.C、TheyareaddictedtotheInternet.D、Theys
A、Theyspecialiseinoneproductonly.B、TheyhaveoutletsthroughoutBritain.C、TheyrunchainstoresincentralLondon.D、They
A、HelearnedalotfromhisstudyinEngland.B、Helearnedmanyforeignlanguagesinhiscollege.C、Hewassatisfiedwithhised
A、Itallowsthemtomeetstudentsfromotheruniversities.B、Itpromotestheconceptofself-learning.C、Itallowsmoreflexibil
随机试题
关于儿童颌骨骨折的治疗,哪项是错误的
企业经理、厂长对企业的安全生产______。
根据《水工建筑物岩石基础开挖工程施工技术规范》SL47—94,严禁在设计建基面、设计边坡附近采用洞室爆破法或()施工。
一个单位在几家银行开设账户的,可以在这几家银行开设的任何一个账户支取现金。()
家庭生命周期中家庭成熟期阶段会产生的财务状况有()。Ⅰ.收入增加而支出稳定,在子女上学前储蓄逐步增加Ⅱ.支出随成员固定而趋于稳定,但子女上大学后学杂费用负担重Ⅲ.可积累的资产达到巅峰,要逐步降低投资风险Ⅳ.收入达到巅峰,支出相对
基金收益分配一般有分配现金和()两种形式。
Thebridgeacrosstheriverhadbeenbadlydamaged.Theengineershadrepaireditduringthenight,andGrachikovwas【C1】_______
某厂有五种产品:甲、乙、丙、丁、戊。它们的年销售额之间的关系为:丙没有丁高,甲没有乙高,戊没有丁低,而乙不如丙高。请问,年销售额最高的产品是()。
1950年6月,中共七届三中全会确定的中心任务是()
TheDifferenceBetweenSpokenandWrittenEnglishI.Thedefinitionofspeechandwritingtwo【T1】______methodsofcommunicatio
最新回复
(
0
)