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
49
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
Divorceisoneofthosecreations,likefastfoodandliterock,thathasmorepeoplewillingtoindulgeZinitthanpeoplewill
Divorceisoneofthosecreations,likefastfoodandliterock,thathasmorepeoplewillingtoindulgeZinitthanpeoplewill
"Always"."Never".TheseareprobablythetwomostpowerfulwordsintheEnglishlanguage.Evenmorepowerfulthanyesandno,s
Thebestsolutionistostoppretendingthatpeople’spersonalinformation,suchasSocialSecurityaccountnumbersandbirthda
Anumberofprocessesorphaseshavebeenidentifiedastypicalofcreativethinking.【F1】Inwhatlogicallywouldbethefirstph
Manyscientistsconsiderphysicsastheprototypeofascience,andindeed,physicsexhibitsanumberoffeatureswhichcanber
Manyscientistsconsiderphysicsastheprototypeofascience,andindeed,physicsexhibitsanumberoffeatureswhichcanber
【F1】Waterpollutioninvolvesthereleaseintolakes,streams,rivers,andoceansofsubstancesthatbecomedissolvedorsuspende
随机试题
A、Itburnedout6towns.B、24peoplewereinjured.C、4peoplelosttheirlivessofar.D、About300,000houseswereburntdown.B
治疗心源性哮喘宜选用
下列选项中,属于行政处分的有()。
蜗杆传动工作时,效率一般为0.7~0.8,具有自锁时效率小于()。
在三级清算模式中,()是指由证券中央登记结算机构同异地资金集中清算中心(异地清算代理机构)办理的证券清算。
一般情况下,产权多元化的物业管理区域是由()在业主大会的授权下作为合同主体与物业服务企业签订物业服务合同。
学习完鲁迅的小说《故乡》,学生认识了闰土这一令人难忘的人物,教师要求学生搜集鲁迅小说里的其他典型人物。下列选项中不符合要求的一项是()。
日常教学活动中,教师应该引导学生做到“举一反三”“触类旁通”“闻一知十”,这种现象在教育心理学上称为()。
请在【答题】菜单下选择【进入考生文件夹】命令,并按照题目要求完成下面的操作。注意:以下的文件必须都保存在考生文件夹下。中国的人口发展形势非常严峻,为此国家统计局每10年进行一次全国人口普查,以掌握全国人口的增长速度及规模。按照下列要求完成对第五次、第六
Whatdoesthewomanwantthemantoreadinthenewspaper?
最新回复
(
0
)