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
2012-09-29
55
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 south2 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.
A Significance of Testing Techniques for Sampling Microbes in the Deep Ice Sheet
B Special Features of Lake Vida
C Later Expedition on Mars
D 2004 Revisit Planned for Collecting Lake Water Specimens
E Antarctic Frozen Life Sampled and Revived
F Accidental Discovery of Ice-sealed Lake Water in Antarctica
Paragraph ______
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,获得了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/8t1d777K
本试题收录于:
职称英语卫生类C级题库职称英语分类
0
职称英语卫生类C级
职称英语
相关试题推荐
Somepeopleholdthatoldpeopleshouldbetakencareathome,whileothersthinktheyshouldbeplacedinoldpeople’shouse.W
Readthefollowingpassageandchoosethebestwordforeachspace.Moneyspentonadvertisingismoneyspentaswellasany
Readthefollowingpassageandchoosethebestwordforeachspace.Moneyspentonadvertisingismoneyspentaswellasany
Internationaltradeistheexchangeofgoodsandservicesproducedinonecountryforgoodsandservicesproducedinanothercou
Formuchofthepastdecade,AmericanandBritishscientistshavebeenannoyedbythephenomenonknownastheFrenchParadox.Nu
Accordingtothearticle,familiesandthewholesocietybenefitfromwomen’s______.Itcanbeconcludedfromthepassagethat
Accordingtothearticle,familiesandthewholesocietybenefitfromwomen’s______.Inwhatwaydowomencontributetothesm
StressCanMakeYouSickScientistsarenowstudyinganewfieldofresearchwhichiscalledpsychoimmunology(心理免疫学).Itisb
Haveyoutalkedtoherlately?
Itisreportedthatonlyapartofpeopleexperienceintheirlife.ProfessorIforCapehasconductedaseriesofclinicaltri
随机试题
被誉为“抒情的人道主义者,中国最后一个纯粹的文人,中国最后一个士大夫”的作家是()
据新华社2019年7月15日电,国务院近日印发《国务院关于实施健康中国行动的意见》及《健康中国行动组织实施和考核方案》,聚焦当前主要健康问题和影响因素,围绕疾病预防和健康促进两大核心,明确了三方面共()。
清营汤主治病证中身热的特点是
某建设工程项目的设备及工器具购置费为680万元,建筑安装工程费35万元,工程建设其他费用28万元,基本预备费率3%,则该项目的基本预备费为()万元。
《劳动法》禁止用人单位招用未满()周岁的未成年人。
某商品价格下降10%,销售量上升25%,则该商品的需求价格弹性系数为()。
样张是王红同学利用Word制作文档结果的一部分,其中剪贴画的环绕方式为()。
影响课堂管理的主要因素有()
Nietzsche(Germanphilosopher)
Don’tworry,behappyand,accordingtoanewresearch,youwillalsobehealthy.Itisestimatedthatoverthecourseofon
最新回复
(
0
)