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
Sometimes the biggest finds are the smallest finds. Researchers examining a(26)______of siltstone(粉砂岩)taken from ground along th
Sometimes the biggest finds are the smallest finds. Researchers examining a(26)______of siltstone(粉砂岩)taken from ground along th
admin
2013-09-09
29
问题
Sometimes the biggest finds are the smallest finds. Researchers examining a(26)______of siltstone(粉砂岩)taken from ground along the Beardmore glacier(冰川)in Antarctica found something(27)______. They found a fly. Well, not exactly a fly. They found a fly (28)______—it’s a segment of the protective shell of a fly worm. While the worms are still growing, they are(29)______by a thin shell. And where there’s worm shell, there are flies. So what are flies doing in Antarctica? It’s much too cold there for flies. And the closest(30)______location, South America, is thousands of miles away.
Part of the answer is that the fly fossil is(31)______—it was found with a number of other fossilized things that have been dated between three million and seventeen million years old. It’s possible that the fly lived during a period when sea(32)______were much lower there than they now are. Lower sea levels means wider continents—think of standing on the (33)______of a beach and having the water pull back.(34)______ . Or maybe not. Maybe flies are much older than anyone thought.(35)______. But that was around eighty million years ago, and flies aren’t thought to be that old.
Whatever the answer is, something in our understanding of the continents, the seas, or fly evolution has to be fixed.(36)______
(36)
Sometimes the biggest finds are the smallest finds. Researchers examining a(26)segment of siltstone(粉砂岩)taken from ground along the Beardmore glacier(冰川)in Antarctica found something(27)unexpected. They found a fly. Well, not exactly a fly. They found a fly(28)fossil—it’s a segment of the protective shell of a fly worm. While the worms arc still growing, they are(29)protected by a thin shell. And where there’s worm shell, there are flies. So what are flies doing in Antarctica? It’s much too cold there for flies. And the closest(30)fly-friendly location, South America, is thousands of miles away.
Part of the answer is that the fly fossil is(31)ancient —it was found with a number of other fossilized things that have been dated between three million and seventeen million years old. It’s possible that the fly lived during a period when sea(32)levels were much lower there than they now are. Lower sea levels means wider continents—think of standing on the(33)edge of a beach and having the water pull back.(34)And wider continents means it’s more likely that living things might travel across the gap. Or maybe not. Maybe flies are much older than anyone thought.(35)We know that what we now call Antarctica was once connected to both South America and Australia. But that was around eighty million years ago, and flies aren’t thought to be that old.
Whatever the answer is, something in our understanding of the continents, the seas, or fly evolution has to be fixed.(36)That’s one of the best things about science—a really big change can come from the discovery of something really small.
选项
答案
That’s one of the best things about science—a really big change can come from the discovery of something really small
解析
转载请注明原文地址:https://kaotiyun.com/show/rzc7777K
0
大学英语四级
相关试题推荐
Howmenfirstlearnedtoinventwordsisunknown;inotherwords,theoriginoflanguageisa【C1】______.Allwereallyknowis
TaketotheHills!Theridergallopedattopspeeddownthehillandonintothevalley,throughthepouringrain."Thedam
GreenWaveWashesOverMainstreamShoppingResearchinBritainhasshownthat"greenconsumers"continuetoflourishasasi
GreenWaveWashesOverMainstreamShoppingResearchinBritainhasshownthat"greenconsumers"continuetoflourishasasi
Duringthe1980s,unemploymentandunderemploymentinsomecountrieswasashighas90percent.Somecountriesdidnot【C1】______
Wefindthatbrightchildrenarerarelyheldbackbymixedabilityteaching.Onthecontrary,boththeirknowledgeand【B1】______
A、VisitinganexhibitionaboutChina.B、Walkinginagarden.C、Choosingaplacetolive.D、Lookingatamagazineadvertisingfla
A、He’sbeenoutthewholeday.B、He’ssufferingfromabadcold.C、He’stakensomeherbalmedicine.D、He’shalf-awakeanddizzy.
A、TheNewYorkTimes.B、TheWallStreetJournal.C、Fortune.D、PsychologyToday.A
Google’sGoogleproblemGoogleiskillingGoogleReader.UseofGoogleReader,atool,bytheway,forreadingonlineconten
随机试题
A.阿司匹林B.华法林C.潘生丁D.普通肝素预防房颤栓塞并发症首选
口服避孕药物的作用原理为
关于职业健康安全初始评审的描述,正确的是()。
某县级市人口为25万人,中间高四周低,南、西、北侧均有河流通过,西侧有铁路客运站和货运站,南侧有一级公路。规划向南发展,并在铁路东西规划了工业和物流用地,结合北侧的水系规划了湿地公园,并有15公顷的广场用地。请论述规划存在哪些问题,为什么?
穿堤闸基础在人工开挖过程中,临近设计高程时,保护层暂不开挖的范围是()。
下列描述中不属于用来判断《专利法》所确定的实用新型的特征的是()。
依据一次能源的不同,发电厂可分为()。
公元前五世纪前后,东西方几乎同时出现的第一次思想文化高峰期,被称为人类的轴心时代。代表当时中两方文明杰出成就的标志性人物是()。
在国际单位制七个基本单位中,不包括下面哪个?()
行使管制权的主体是乡级以上人民政府的公安机关。
最新回复
(
0
)