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
考研
Now that we are fairly sure that there are many Earth-like planets in the Galaxy, the time is ripe (or almost so) to wonder whet
Now that we are fairly sure that there are many Earth-like planets in the Galaxy, the time is ripe (or almost so) to wonder whet
admin
2017-08-11
57
问题
Now that we are fairly sure that there are many Earth-like planets in the Galaxy, the time is ripe (or almost so) to wonder whether these new worlds do indeed have a high probability of hosting new forms of life.
Currently, the best【C1】______on the existence of other planets comes from NASA’s【C2】______Kepler satellite, which has been mapping an area of the sky【C3】______some 150,000 stars.
Scientists estimate that around 5 percent of planets in our galaxy have masses similar【C4】______Earth’s and, possibly, are within the habitable zone of their stars, meaning that【C5】______they hold water it has a high chance of being liquid.【C6】______there are about 200 billion stars in our galaxy alone, scientists estimate that there should be about 10 billion Earth-size planets. Not bad, especially if we【C7】______that to be Earth-size and within a habitable zone is all it takes for life to take hold in an【C8】______world. In practice, however, the situation is much more【C9】______, since it depends on what life is and how it appears in a planet,【C10】______on the planet’s detailed geological history.
Here on Earth life appeared some 3.5 billion years ago.【C11】______that it may have been here as far【C12】______as 3.8 billion years ago remain tentative. For about the first three billion years, life on earth was【C13】______in the form of single-cell creatures. Only when Earth’s atmosphere was full of oxygen did more sophisticated organisms appear.
【C14】______its unusual atmosphere, Earth’s heavy, single moon, its magnetic field also did something else that allowed complex life to【C15】______on its surface.【C16】______these, Complex life would find it very hard to【C17】______and survive.
The results from Kepler’s mission are encouraging and exciting. We have the【C18】______of confirming the existence of countless other worlds out there. Based on these findings, we should indeed【C19】______that other worlds would host some kind of simple life. However, as some scientists argued, Earth and its ability to host complex life will probably remain a【C20】______phenomenon in this and other galaxies.
【C19】
选项
A、suspect
B、pledge
C、celebrate
D、conclude
答案
D
解析
根据空格前的Based on these findings,可知空格后的内容为基于发现所得出的结论。D项conclude“推断,认定”符合前后语义要求。
转载请注明原文地址:https://kaotiyun.com/show/wcbZ777K
0
考研英语一
相关试题推荐
Ittakesawholegalaxyofthingstomakeyouhappy.Happinessisastateyoufeelwhenyouhavenoproblems,worries,doubtsor
Moreboysthangirlsarcbornallovertheworld,butanewstudyhasfoundthatthecloserpeoplelivetotheequator,thesmal
Thebestsolutionistostoppretendingthatpeople’spersonalinformation,suchasSocialSecurityaccountnumbersandbirthda
Thebestsolutionistostoppretendingthatpeople’spersonalinformation,suchasSocialSecurityaccountnumbersandbirthda
Ananalysisof20,928postmenopausalwomenshowedthatthetallerawomanis,thegreaterherriskforanumberofcancers,incl
Anumberofprocessesorphaseshavebeenidentifiedastypicalofcreativethinking.【F1】Inwhatlogicallywouldbethefirstph
Anumberofethicalquestionsclusteraroundbothendsofthehumanlifespan.Whetherabortionismorallyjustifiablehaspopul
Manyscientistsconsiderphysicsastheprototypeofascience,andindeed,physicsexhibitsanumberoffeatureswhichcanber
Sevenyearsago,agroupoffemalescientistsattheMassachusettsInstituteofTechnologyproducedapieceofresearchwhichsh
随机试题
胎殒之后,阴道流血不止,甚至大量出血,腹痛阵阵紧逼,舌淡白,脉沉细无力。其治法
哪项不属于公益论原则
狂证的治疗原则是痴呆的治疗原则是
血浆渗透压增高最敏感的临床指标是
女,48岁。反复双手近端指间关节、膝关节痛伴晨僵2年,肘部伸侧可触及皮下结节,质硬、无触痛。诊断首先考虑
下列有关公民权利能力的表述,哪一项是错误的?
适合扑救脂类、石油产品等B类火灾以及木材等A类物质的初起火灾,但不能扑救B类水溶性火灾,也不能扑救带电设备及C类和D类火灾的灭火器类型是()灭火器。
工程竣工验收合格之日起()日内,建设单位应及时提出竣工验收报告,向工程所在地县级以上地方人民政府建设行政主管部门(及备案机关)备案。
关于自动化仪表管路安装要求的表述,不正确的是()。
C是线段AB上一点,D是线段CB的中点,已知图中所有线段的长度之和为23,线段AC和线段CB的长度都是正整数,那么线段AC的长度为()。
最新回复
(
0
)