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
2010-06-30
31
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 (神户)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 temblor (震动) is mild or a killer. Earthquake formation can be triggered by many factors, says Hiroo Kanamori, formation can be triggered by many factors, says Hiroo Kanamori, a seismologist (地震学家)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 temblor, 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
转载请注明原文地址:https://kaotiyun.com/show/bOPd777K
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
WhichofthefollowingistheacceptabletablemannerinBritain?
Thefollowingpassageisdividedintothreesections.Youareaskedtofindoutinwhichsectionsthe10statementsarediscusse
Whatdoesthespeakermainlydiscuss?
RecentsurveysshowthatJapaneseyouthhavebecomea"MeGeneration"thatrejectstraditionalvalues."Around1980manyJap
RecentsurveysshowthatJapaneseyouthhavebecomea"MeGeneration"thatrejectstraditionalvalues."Around1980manyJap
AnswerQuestions71to80byreferringtothecommentson4differentcarmodelsinthefollowingmagazinearticle.Answereach
AnswerQuestions71to80byreferringtothecommentson4differentcarmodelsinthefollowingmagazinearticle.Answereach
DaffodilsbloomandchocolateeggsmeltasthelongEasterweekenddrawsnear.Alongsidesuchpleasuresisanother,equallyseas
A、Money.B、Freedom.C、Knowingdifferentpeople.D、Travelingalot.B
Whatisthetelephonecallabout?
随机试题
能治冠心病心绞痛及心律失常等,最善行血止痛的药物是
患者,男,20岁。反复发作胸闷,气急,咳嗽1年。查体:两肺满布哮鸣音。应首先考虑的是
背景某工程公司承接到某本地网架空光缆线路工程,合同规定施工单位负责采购除光缆、接头盒及尾纤以外的其他材料,工费按定额价格的5.2折计取。公司根据本企业的管理文件要求,将全部材料费和折扣后工费的75%核算给本工程的项目部作为现场开支,并给项目部配备
沥青混合料按组成结构分类原则可分为()。
提出学习过程应始终以人为本,必须重视学习者的意愿、情感、需要等的学习观是由()提出的。
海洋表层的运动主要受海平面风的牵制。信风的存在使得大量暖水被吹送到赤道西太平洋地区.而赤道东太平洋地区暖水被刮走后,主要靠海面以下的冷水进行补充,因此,赤道东太平洋海温比西太平洋海温明显偏低。当信风加强时,赤道东太平洋深层海水涌升上翻现象更加剧烈,导致海表
全面抗战爆发后,中国军队取得的首次大捷是()。
电视纪录片的宗旨在于()。
求幂级数的收敛域及其和函数.
Thepolicediscoveredthethief’shide-outtwodayslater,______,however,thethieveshaddisappeared.
最新回复
(
0
)