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
When Jules Verne wrote Journey to the Center of the Earth in 1864, there were many conflicting theories about the nature of the
When Jules Verne wrote Journey to the Center of the Earth in 1864, there were many conflicting theories about the nature of the
admin
2010-01-07
58
问题
When Jules Verne wrote Journey to the Center of the Earth in 1864, there were many conflicting theories about the nature of the Earth’ s interior. Some geologists thought that it contained a highly compressed ball of incandescent gas, while others suspected that it consisted of separate shells, each made of different materials. Today well over a century later, there is little direct evidence of what lies beneath our feet. Most of our knowledge of the Earth’ s interior comes not from mines or boreholes, but from the study of seismic waves--powerful pulses of energy released by earthquakes.
The way that seismic waves travel shows that the Earth’ s interior is far from uniform. The continents and the seabed are formed by the crust--a thin sphere of relatively light, solid rock. Beneath the crust lies the mantle, a different layer that extends approximately halfway to the Earth’ s center. There the rock is the subject of a battle between increasing heat and growing pressure.
In its high levels, the mantle is relatively cool; at greater depths, high temperatures make the rock behave more like a liquid than a solid. Deeper still, the pressure is even more intense, preventing the rock from melting in spite of a higher temperature.
Beyond a depth of around 2,900 kilometers, a great change takes place and the mantle gives way to the core. Some seismic waves cannot pass through the core and others are bent by it. From this and other evidence, geologists conclude that the outer core is probably liquid, with a solid center. It is almost certainly made of iron, mixed with smaller amounts of other elements such as nickel.
The conditions in the Earth’ s core make it a far more alien world than space. Its solid iron heart is subjected to unimaginable pressure and has a temperature of about 9,000°F. Although scientists can speculate about its nature, neither humans nor machines will ever be able to visit it.
Why does the author state in the last paragraph that the Earth’ s core is "more alien" than space?
选项
A、Government funds are not available to study the Earth’ s core.
B、Scientists aren’ t interested in the characteristic of the Earth’ s core.
C、It is impossible to go to the Earth’ s core to do research.
D、The Earth’ s core is made of elements that are dangerous to humans.
答案
C
解析
本题为逻辑推理题,不论是人类还是机械,都永远无法接触到地球地心。
转载请注明原文地址:https://kaotiyun.com/show/VuPd777K
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?
Ascientistoncesaid,"Ihaveconcludedthattheearthisbeingvisitedbyintelligentlycontrolledvehiclesfromouterspace."
SomepeopleusedtosaythatDadhadsomanychildrenthathecouldn’tkeeptrackofthem.Dadhimselfusedto【1】astoryabouto
Couldthebadolddaysofeconomicdeclinebeabouttoreturn?SinceOPECagreedtosupply-cutsinMarch,thepriceofcrudeoil
Couldthebadolddaysofeconomicdeclinebeabouttoreturn?SinceOPECagreedtosupply-cutsinMarch,thepriceofcrudeoil
Couldthebadolddaysofeconomicdeclinebeabouttoreturn?SinceOPECagreedtosupply-cutsinMarch,thepriceofcrudeoil
AnswerQuestions71to80byreferringtothecommentson4differentcarmodelsinthefollowingmagazinearticle.Answereach
AnswerQuestions71to80byreferringtothecommentson4differentcarmodelsinthefollowingmagazinearticle.Answereach
AnswerQuestions71to80byreferringtothecommentson4differentcarmodelsinthefollowingmagazinearticle.Answereach
AnswerQuestions71to80byreferringtothecommentson4differentcarmodelsinthefollowingmagazinearticle.Answereach
随机试题
关于牙周炎描述:①临床特征是:牙龈出血、牙齿松动、牙周溢脓;②是一种由细菌微生物引起的牙周组织炎症性破坏性疾病;③主要病理改变是:结合上皮破坏性向根方移位,牙周袋形成,牙槽骨吸收;④晚期牙齿松动、脱落;⑤所
背景某机电工程公司以EPC方式中标了一化工厂建设工程项目。由于其地处偏僻,规模大,需要较大的临时用电量,并编制了临时用电施工组织设计;考虑工程设备不仅是大件,设备也多,而且需要较多的大型吊装设备,以及施工中高空作业和交叉作业多、工期紧等特点,为确
某外商投资企业2000年度发生如下经济事项:(1)2000年4月,签订销售合同一份,金额50万元。(2)2000年11月,审查后发现记载资金的账户比期初多出100万元,其中包括应拨付给外地分支机构的资金30万元。(3)2000年12月,按规定到有关部
某企业本年度的年平均资产总额为2000万元,当年实现销售收入净额700万元,实现净利润112万元,当年平均资产负债率为60%,则该企业本年度的净资产收益率为()。
甲企业从乙企业购进一批设备,价款为80万元。甲企业开出一张付款期限为6个月的已承兑的商业承兑汇票给乙企业,丙企业在该汇票的正面记载了保证事项。乙企业取得汇票后,将该汇票背书转让给了丁企业。汇票到期,丁企业委托银行收款时,才得知甲企业的存款账户不足支付。银行
论述提单业务内容。
某教师设计了如下试题,考查学生理论联系实际的能力。发电站向某地远距离输电,如果发电机输出功率为P,输送电压为U(即经升压变压器升压后的电压),恰好能满足该地原来用电需要。现由于该地经济发展,用电量增大,要求用电功率增加20%,采取以下哪个措施恰好
以下是关于主题数据库和应用项目的描述:Ⅰ.多个应用项目可以共同使用一个主题数据库Ⅱ.一个应用项目也可以使用多个主题数据库Ⅲ.一个主题数据库只能被一个应用项目使用Ⅳ.主题数据库一般应该独立于应用项目其中正确的
下列关于赋值运算符=重载的叙述中,正确的是
A、Thewaterwassweet.B、Thewaterhadsavedhislife.C、Hewantedtolurethegoattodescend.D、Hewantedtocomfortthegoat.
最新回复
(
0
)