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
Icy Microbes 1 In ice that has sealed a salty Antarctic lake for more than 2,800 years, scientists have found frozen bacteria a
Icy Microbes 1 In ice that has sealed a salty Antarctic lake for more than 2,800 years, scientists have found frozen bacteria a
admin
2009-06-15
50
问题
Icy Microbes
1 In ice that has sealed a salty Antarctic lake for more than 2,800 years, scientists have found frozen bacteria and algae that returned to life after thawing. The research may help in the search for life on Mars, which is thought to have subsurface lakes of ice.
2 A research team led by Peter Doran of the University Of Illinois at Chicago drilled through more than 39 feet of ice to collect samples of bacteria and algae. When Doran’s team brought them back and warmed them up a bit, they sprang back to life.
3 Doran said the microbes have been age-dated at 2,800 years old, but even older microbes may live deeper in the ice sheet sealing the lake, and in the briny water below the ice. That deeper ice and the water itself will be cautiously sampled in a later expedition that will test techniques that may one day be used on Mars.
4 Called Lake Vida, the 4.5-square-kilometer body is one of a series of lakes located in the McMurdo Dry Valleys of Antarctica, some 2,200 kilometers due south of New Zealand. This lake has been known since the 1950s, but people ignored it because they thought it was just a big block of ice. While at the site for other research in the 1990s, Doran and his colleagues sent radar signals into the clear ice covering the lake and were surprised to find that 62 feet below there was a pool of liquid water that was about seven times more salty than seawater.
5 That prompted the researchers to return in 1996 with equipment to drill a hole down to within a few feet of the water layer. At the bottom of this hole, researchers harvested specimens of . algae and bacteria.
6 The researchers will return in 2004 equipped with instruments that are sterilized. They will then drill through the full 62 feet of ice and sample some of the briny water from the lake for analysis. The water specimen will be cultured to see if it contains life. Specimens from the water are expected to be even older than the life forms extracted from the ice covering.
选项
答案
E
解析
本段说及Doran考察队在南极冰块上钻洞深达39英尺,获得微生物和水藻的样本。解冻后这些微生物和水藻又复活了。选项E概括了本段的大意。
转载请注明原文地址:https://kaotiyun.com/show/rjhd777K
本试题收录于:
职称英语理工类基础题库职称英语分类
0
职称英语理工类基础
职称英语
相关试题推荐
HeartAttackThroughouttheUnitedStates,andespeciallyinbigcitiesandruralareas,tensofthousandsofpeoplewithhearts
AThreatPosedbyEnglishBDefinitionofaSpeechCommunityCBenefitsofLearningaSecondLanguageDAdvantagesofLearni
AThreatPosedbyEnglishBDefinitionofaSpeechCommunityCBenefitsofLearningaSecondLanguageDAdvantagesofLearni
EnglishandEnglishCommunity1.ThereisnodoubtthatEnglishisausefullanguage.ThepeoplewhospeakEnglishtodaymakeup
OneoutoffiveAmericanchildrensuffersfromdyslexia.Manygreatthinkersandscientistsintheworldaredyslexic.
Whichofthefollowingareahasthehighestaveragepopulationdensity?TherearenopermanentinhabitantsinAntarcticabecaus
Frommystandpoint,thisthingisjustridiculous
Frommystandpoint,thisthingisjustridiculous.
Hercommentsaboutmenareutterlyridiculous.
Thestorywastouching.
随机试题
钱澄之后期诗歌的特点是【】
人格包括
公路隧道岩爆地段的岩爆烈度等级划分为()。
阿伦和梅耶所进行的综合研究提出的承诺不包括()。
所谓网络戏谑文化,是网民长期以来在互联网上形成的一种话语表达方式,不知从何时起,中国互联网拥有了一种特殊的语境,很多时候,反讽和隐喻比更有力,嬉笑的态度比严肃的发言更接近事情本质,戏谑的效果通常是通过猛烈的反差和鲜明的对比才得以形成的。填入划横线部
源起于美国次贷危机的此次全球性金融风暴,固然起于经济领域,但是,一石激起千层浪,如果不是人性中超乎现实允许范围的物质欲求过度膨胀,原本出于虚拟经济的一个颇有想象力的创意,也不会滚雪球般失控,以至弥漫成灾。那些从小优秀得无以复加的华尔街金融精英们,卖力煽动着
光雾山秋天的色彩总是那么灿烂,那么色彩斑斓。红叶、黄叶、绿叶,红的火焰跳跃,绿的苍郁翠微。如此诗情画意,怎不________?填入画横线部分最恰当的一项是()。
文艺复兴时期,成功塑造了一个典型的没落骑士的小说是()。
有如下的程序:#include<iostream>usingnamespacestd;classAT{friendostream&operator<<(ostream&,AT);}at;os
A、Itiselaboratelydecorated.B、Ithassurvivedsome2,000years.C、Itisverybig,withonlysixslimlegs.D、Itisshapedlik
最新回复
(
0
)