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
88
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
F
解析
本段要表达的意思是:冰下湖是科学家在做other research时偶然发现的。
转载请注明原文地址:https://kaotiyun.com/show/Nt1d777K
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
Readthefollowingletterandcompletethegiveninformationform.Writeaword,phraseornumberinthespaces1-5.De
Readthefollowingpassageandchoosethebestwordforeachspace.Moneyspentonadvertisingismoneyspentaswellasany
Readthefollowingpassageandchoosethebestwordforeachspace.Moneyspentonadvertisingismoneyspentaswellasany
Readthefollowingpassageandchoosethebestwordforeachspace.Moneyspentonadvertisingismoneyspentaswellasany
Whatdoyouthinkofwhenyouhearthewordmotherhood?Ifyouarelikemostpeople,youassociatemotherhoodwithanumberofp
Amulticulturalpersonissomeonewhoisdeeplyconvincedthatallculturesareequallygood.【R1】______Andmostlikelyhehasbe
ThenumberofspeakersofEnglishinShakespeare’stimeisestimatedtohavebeenaboutfivemillion.Todayitisestimatedthat
Playistheprincipalbusinessofchildhood,andinrecentyearsresearchhasshownthegreatimportanceofplayinthedevelopm
TheysaytheiceinAntarcticaisgettingthinnerallthetime.saidTheiceinAntarctica____________________getting
随机试题
《香市》中写道“社庙的左屋被‘公安分局’借去做了衙门”,“社庙的左偏殿上又有什么‘蚕种改良所’的招牌”。这里运用的:表现手法是()
某项经济业务的发生引起了负债和所有者权益的变化,当负债为减少时,所有者权益的变化是______。
9月10日,白糖现货价格为4300元/吨,某糖厂决定利用白糖期货对其生产的白糖进行套期保值。当天以4350元/吨的价格在11月份白糖期货合约上建仓。10月10日,白糖现货价格跌至3800元/吨,期货价格跌至3750元/吨,该糖厂将白糖现货售出,并将
(2010、2009年考试真题)股息率可调整优先股的股息率变化主要由()决定。
下列关于资产的摊销处理中,正确的是()。
某公司向银行申请贷款,并约定以质押的形式提供担保。下列可作为质押物的有()。
延安整风运动最主要的任务是
标志着第一次国共合作正式形成的是()
请在【答题】菜单下选择【进入考生文件夹】命令,并按照题目要求完成下面的操作。注意:以下的文件必须保存在考生文件夹下。为了更好地控制教材编写的内容、质量和流程,小李负责起草了图书策划方案(请参考“图书策划方案.docx”文件)。他需要将图
Whatisthejournalistaccusedof?
最新回复
(
0
)