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
Humans are forever forgetting that they can’ t control nature. Exactly 20 years ago, a Time magazine cover story announced that
Humans are forever forgetting that they can’ t control nature. Exactly 20 years ago, a Time magazine cover story announced that
admin
2010-01-07
67
问题
Humans are forever forgetting that they can’ t control nature. Exactly 20 years ago, a Time magazine cover story announced that scientists are on the verge of being able to predict the time, place and even the size of earthquakes. "The people of quake-ravaged Kobe learned last week how wrong that assertion was."
None of the methods conceived two decades ago has yet to discover a uniform warning signal that preceded all quakes, let alone any sign that would tell whether the coming tremor is mild or a killer. Earthquake formation can be triggered by many factors, says Hiroo Kanamori, a seismologist at the California Institute of Technology. So, finding one all-purpose warning sign is impossible. One reason: Quakes start deep in the earth, so scientists can’ t study them directly. If a quake precursor were found, it would still be impossible to warn humans in advance of all dangerous quakes. Places like Japan and California are riddled with hundreds, if not thousands, of minor faults.
Prediction would be less important if scientists could easily build structures to withstand tremors. While seismic engineering has improved dramatically in the past 10 to 15 years, every new quake reveals unexpected weaknesses in "quake-resistant" structures, says Terry Tullis, a geophysicist at Brown University. In Kobe, for example, a highway that opened only last year was damaged. In the Northridge earthquake, on the other hand, well-built structures generally did not collapse.
A recent report in science adds yet more anxiety about life on the faulty lines. Researchers ran computer simulations to see how quake-resistant buildings would fare in a moderate-size tremor, taking into account that much of a quakes energy travels in a large "pulse" of focused shaking. The results: Both steel-frame buildings and buildings that sit on insulating rubber pads suffered severe damage.
More research will help experts design stronger structures and possibly find quake precursors. But it is still a certainty that the next earthquakes will prove once again that every fault cannot be monitored and every highway cannot be completely quake-proofed.
One of the chief difficulties in accurate earthquake warning is that ______ .
选项
A、earthquakes may take place in anywhere possible
B、earthquakes may happen at any unexpected moment
C、most earthquakes take place simultaneously and unexpectedly
D、the occurrence of earthquakes involves too many unforeseen factors
答案
D
解析
见文章第二段中间。
转载请注明原文地址:https://kaotiyun.com/show/uuPd777K
本试题收录于:
公共英语四级笔试题库公共英语(PETS)分类
0
公共英语四级笔试
公共英语(PETS)
相关试题推荐
Besidesthefunctionsasavitalentertainmentmedium,whatelsecanpeopleuseaTVas?
Therearetwobasicwaystoseegrowth:oneasaproduct,theotherasaprocess.Peoplehavegenerallyviewedpersonalgrowtha
Whowouldbemostinterestedintheadvancesmentionedinthetalk?
SomepeopleusedtosaythatDadhadsomanychildrenthathecouldn’tkeeptrackofthem.Dadhimselfusedto【1】astoryabouto
Couldthebadolddaysofeconomicdeclinebeabouttoreturn?SinceOPECagreedtosupply-cutsinMarch,thepriceofcrudeoil
Forachild,happinesshasamagicalnature.Iremembermakinghide-outsinnewly-cuthay,playingcopsandrobbersinthewoods
AnswerQuestions71to80byreferringtothecommentson4differentcarmodelsinthefollowingmagazinearticle.Answereach
Couldthebadolddaysofeconomicdeclinebeabouttoreturn?SinceOPECagreedtosupply-cutsinMarch,thepriceofcrudeoil
WhathavetheEuropeancountriesagreedonattheBrusselsSummit?
随机试题
薄荷和牛蒡子功效的共同点是
利用吗啡抑制呼吸的作用,可用于治疗
以下( )不属于设备安装工程费用的构成部分。
锅炉本体不包括()部件。
银行业监督管理机构中从事监督管理工作的人员违反规定查询账户或者申请冻结资金,应依法给予行政处分;构成犯罪的依法追究刑事责任。()
张大爷腿脚不便,不能出门,最近他需要办理银行存款查询业务,则下列()业务可以满足其要求。
系统地识别和管理组织内所使用的过程,特别是这些过程之间的相互作用,称之为()。
简述幼儿生活的安全措施。
智力激励法:又称集思广益法、头脑风暴法。以小组讨论会形式产生创造性设想的一种集体创造方法。以下属于智力激励法的一项是()
IfyouthinkJapan’shard-drinkingbusinesscultureisasdeadastheSonyBetamax,thinkagain.Aftermorethanadecadeofeco
最新回复
(
0
)