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
2023-02-14
53
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.
【C7】
选项
A、promise
B、demand
C、define
D、assume
答案
D
解析
上句谈到科学家估计(estimate)的情况,本句that后面的内容依然是科学家推测的情况。选项中,D项assume“假设,设想”指在缺乏证据的情况下也认为某事是真实的,语义和用法均符合要求。空格后that表明的观点只能是“我们”的一种假设,并不是要对其做出“保证”,排除A项promise。“我们”也不可能要求事实必须如此,B项demand“需求,需要”不符合逻辑要求。C项define“下定义,界定”,指精确地解释,也不符合逻辑和语义要求。
转载请注明原文地址:https://kaotiyun.com/show/zRMD777K
0
考研英语二
相关试题推荐
ManyAmericanshavebeenfeedingababyaspirinonceaday,believingitwouldprotectthemfromaheartattack,astroke,ande
ManyAmericanshavebeenfeedingababyaspirinonceaday,believingitwouldprotectthemfromaheartattack,astroke,ande
ManyAmericanshavebeenfeedingababyaspirinonceaday,believingitwouldprotectthemfromaheartattack,astroke,ande
ManyAmericanshavebeenfeedingababyaspirinonceaday,believingitwouldprotectthemfromaheartattack,astroke,ande
ManyAmericanshavebeenfeedingababyaspirinonceaday,believingitwouldprotectthemfromaheartattack,astroke,ande
ManyAmericanshavebeenfeedingababyaspirinonceaday,believingitwouldprotectthemfromaheartattack,astroke,ande
ManyAmericanshavebeenfeedingababyaspirinonceaday,believingitwouldprotectthemfromaheartattack,astroke,ande
Weighingyourselfregularlyisawonderfulwaytostayawareofanysignificantweightfluctuations.【C1】________,whendonetoo
Weighingyourselfregularlyisawonderfulwaytostayawareofanysignificantweightfluctuations.【C1】________,whendonetoo
随机试题
甲涉嫌利用木马程序盗取Q币并转卖他人,公安机关搜查其住处时,发现一个U盘内存储了用于盗取账号密码的木马程序。关于该U盘的处理,下列哪些选项是正确的?()
建设项目需要征收农用地的,应当先行办理()。
施工承包企业根据( )分别划分若干资质类别。
商业银行员工由于知识技能匮乏而给商业银行造成风险的主要行为模式包括()。
上市公司甲公司是ABC会计师事务所的常年审计客户,A注册会计师负责审计甲公司2017年度财务报表。审计工作底稿中与确定重要性和评估错报相关的部分内容摘录如下:(1)A注册会计师确定的甲公司2016年度财务报表整体的重要性为利润总额的5%.即100万元。
下列各项中属于公安机关基本任务的有()。
随着网络、手机等新媒体的迅猛发展,文化市场需要大量的精短影像,反映瞬间的历史和正在发生的事件。微纪录片拍摄节省时间,制作费用低廉,而且时间短,正适合了这种快餐文化欣赏要求和心理。过去几年,人人都是麦克风、个个都是通讯社,如今,又增加为“人人都是演员,个个
《人民警察法》第6条对人民警察的职责作了详细的规定,但是考虑到随着社会的不断发展,还会出现许多新的问题,所以又加了一个概括性规定,即“法律、法规规定的其他职责”,此中的“法律”是指()。
语言在人类的交流中起重要的作用。如果一种语言是完全有效的,那么,其基本语音的每一种可能的组合都能够表达有独立意义和可以理解的词。但是,如果人类的听觉系统接收声音信号的功能有问题,那么,并非基本语音每一种可能的组合都能够成为有独立意义和可以理解的词。
Wheredidthecustomergetthesweater?
最新回复
(
0
)