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
2017-02-17
15
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.
【C3】
选项
A、creating
B、comprising
C、uniting
D、merging
答案
B
解析
空格处动词以现在分词形式出现,引导some 150,000 stars,修饰an area of the sky。B项comprising的原形动词comprise表示“包括,由……构成”,可以反映出“天体中聚集着许多星星”的事实,符合语义要求。
转载请注明原文地址:https://www.kaotiyun.com/show/w0EZ777K
0
考研英语一
相关试题推荐
Fat:whatisitgoodfor?Absolutelynothing,orsoyoumightthink.Butobesityseemstoprotectmiceagainstafatalformofm
Fat:whatisitgoodfor?Absolutelynothing,orsoyoumightthink.Butobesityseemstoprotectmiceagainstafatalformofm
行为科学的建立——2002年英译汉及详解Almostallourmajorproblemsinvolvehumanbehavior,andtheycannotbesolvedbyphysicalandbiological
人类性格与行为形成的原因及影响——1990年英译汉及详解Peoplehavewonderedforalongtimehowtheirpersonalitiesandbehaviorsareformed.Itisnote
人类性格与行为形成的原因及影响——1990年英译汉及详解Peoplehavewonderedforalongtimehowtheirpersonalitiesandbehaviorsareformed.Itisnote
历史研究的方法论——1999年英译汉及详解【F1】Whiletherearealmostasmanydefinitionsofhistoryastherearehistorians,modernpracticemostc
历史研究的方法论——1999年英译汉及详解【F1】Whiletherearealmostasmanydefinitionsofhistoryastherearehistorians,modernpracticemostc
现代政府依赖专家人才——2000年英译汉及详解Governmentsthroughouttheworldactontheassumptionthatthewelfareoftheirpeopledependslargely
随机试题
测量绝缘电阻使用的仪表是_________。
Thousandsof______atthestadiumcametotheirfeettopaytributetoanoutstandingperformance.
进行核素治疗的住院患者的注意事项中,正确的是
以体重判断肥胖的标准是
某公司研制成功一种新型节水灌溉设备,现在需要决定是否大规模投产。有关资料如下:(1)公司销售部门预计,如果每台定价3万元,销售量每年可以达到10000台,销售量不会逐年上升,但价格可以每年提高2%。生产部门预计,变动制造成本每台2.1万元,每年增加2%,
如果注册会计师在审计过程中,发现被审计单位确实存在导致财务报表严重失实的错误和舞弊,则注册会计师首先作出的反应是()。
下列关于生活常识的说法不正确的是()。
Applet的运行过程要经历4个步骤,其中()不是运行步骤。
WeShouldn’tTotallyTurntotheInternet1.现在不少人一遇到问题就上网搜答案2.这种现象可能产生的影响3.你认为应该怎么做?
Wewerelateas【C1】______.Myhusbandhadinsistedondoinghis【C2】______byhimself,andwhenhediscoveredthathecouldn’t【C
最新回复
(
0
)