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
Since early times, people have been fascinated with the idea of life existing somewhere else besides earth. Until recently, scie
Since early times, people have been fascinated with the idea of life existing somewhere else besides earth. Until recently, scie
admin
2015-10-18
28
问题
Since early times, people have been fascinated with the idea of life existing somewhere else besides earth. Until recently, scientists believed that life on other planets was just a【B1】______ dream. But now they are beginning to【B2】______places where life could form. In 1997, they saw evidence of planets near other stars like the sun. But scientists now think that life could be even nearer in our own【B3】______ system. One place scientists are studying very closely is Eu- ropa, a moon of Jupiter. Space probes have【B4】______ evidence that Europa has a large ocean under its surface. The probes have also made scientists think that under its surface Europa has a rocky core【B5】______ volcanic heat Water and heat from volcanic activity are two basic conditions needed for life to form. A third is certain basic chemicals such as carbon,【B6】______ and nitrogen. Scientists believe there might be such chemicals lying at the bottom of Eu- ropa’s ocean. They may have already created life, or may【B7】______. You may wonder if light is also needed for life to form. Until recently, scientists thought that light was【B8】______. But now, places have been found on earth that are in total blackness, such as caves several miles beneath the surface, and bacteria,【B9】______forms of life, have been seen there. So the lack of light in Europa’s subsurface ocean doesn’t automatically【B10】______ life forming.
【B8】
选项
答案
essential
解析
转载请注明原文地址:https://jikaoti.com/ti/KZuFFFFM
0
大学英语四级
相关试题推荐
Weallliketofeelneeded.Butnewresearchsuggestshavingasenseofpurposeisgoodforourhealth,too.Inastudyof7
ThanksgivingisAmerica’snationalholidayforgivingthankstoGod.ThanksgivingDayhasaspecial【C1】______forAmericansbecau
A、Friendsshouldbewillingtosacrificeandneveraskforrewards.B、Thereshouldbenosecretsbetweenfriends.C、Friendsshou
A、Theycanenjoyawell-plannedtrip.B、Theycangettheaccuratepriceoftravelimmediately.C、Theycanenjoyahappyvacation
A、Hisgirlfriendcomplainedofhisgoingtothepartywithouther.B、Hewastogetherwithhisgirlfriendyesterday.C、Hehasbee
A、TellJoeaboutthereceptiondinnerintime.B、Prepareanothermoreinterestingstory.C、Practicemorebeforetellingthestor
A、Havingregularmorningmeetings.B、Goingshoppingwithhiswife.C、Havingeveningdinnerathome.D、Havinginterviewwithjour
Forcenturiesmandreamedofachievingverticalflight.LeonardodaVinciconceivedthefirstmechanicalapparatus(仪器),whichco
Forcenturiesmandreamedofachievingverticalflight.LeonardodaVinciconceivedthefirstmechanicalapparatus(仪器),whichco
随机试题
在机械装配和修理中,经纬仪主要用来测量精密机床的水平转台和万能转台的分度误差。( )
调配前宜盐炙的药物是
下列关于高温作业工人在供给饮料和补充营养时。不合理的是
房地产业是房地产开发活动的()。
如图5-44所示二梁弯曲刚度EI相同,载荷q相同,则下列4种关系中,正确的为()。
请认真阅读下列材料,并按要求作答。问题:依据拟定的教学目标,设计技术教学环节的步骤。
下列各项对审计证据充分性和适当性之间的关系表述,不正确的是()。
建立孩子自尊心的最好方法是尊重孩子,把孩子当作和自己完全平等的人来对【166】。当父母尊重孩子的时候,他开始尊重自己,进而他会尊重别人。这样他的“人化”过【167】才能启动。建立孩子自尊心的第二个重要的方法是无条件地爱孩子。当父母无条件地爱孩子的【168】
Nancyhasn’tbegunworkingonherPh.D.______workingonhermaster’s.
ThefirstbabyinBritaintosurviveahearttransplantcelebratedher18thbirthdayyesterday.KayleeDavidsonwasfivemonths
最新回复
(
0
)