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)______
(34)
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
And wider continents means it’s more likely that living things might travel across the gap
解析
转载请注明原文地址:https://jikaoti.com/ti/1eQFFFFM
0
大学英语四级
相关试题推荐
A、Becausetheydon’thavetimetowanderoffontheirown.B、Becausetheycannotspeaktheforeignlanguage.C、Becausetheyhave
A、Sheoftenstaysupreadinglate.B、Themanshouldspendmoretimestudying.C、Shewondershowthemanmanagesthatwithsolit
Japanisgoingthroughacomplexnationalidentitycrisis.Thatmaybenobadthing,saysanewbookbyanAmericanresearcher.
Howmenfirstlearnedtoinventwordsisunknown;inotherwords,theoriginoflanguageisa【C1】______.Allwereallyknowis
Duringthe1980s,unemploymentandunderemploymentinsomecountrieswasashighas90percent.Somecountriesdidnot【C1】______
TheWarringStatesPeriodlasts250years.TheTangDynasty’sprosperityliesinitsstrictlaws.
Theaccessibilityofcleanwaterisoneofthemostimportantcomponentsinthehealthofyoungchildren.Inmanyareas,disease
DemandsforstrongerprotectionforwildlifeinBritainsometimeshidethefactthatsimilarneedsarefeltintherestofEurop
A、Patient.B、Surprised.C、Worried.D、Irritated.B先看选项,听的时候一定要听清楚相关内容,"Ican’tbelieveit",由此断定B为正确答案。
Whatdoesthespeakertellusaboutimportantdecision-makingintheUS?
随机试题
1950年6月,中央人民政府颁布的土地法是()
听觉感受器位于()
中国特色社会主义文化建设的根本是()。
男,62岁,反复心绞痛1年,3小时前突发心前区痛,向左肩臂放射,伴大汗,含硝酸甘油无效。血压100/60mmHg,心率92次/分,律齐,心尖部Ⅱ级收缩期杂音。双肺(﹣)。全科医生接诊后初步诊断印象是
A.1.5~2.5gB.±10%C.1.95~2.05gD.百分之一E.千分之一《中国药典》规定“精密称定”时,指称取重量应准确至所取重量的()。
某科技类上市公司在研讨内部控制时,强调要制定合适的业务流程图、岗位说明书来规范每个人的职责分工,使其各司其职,各就其位,并严格责任追究制。该公司所强调的是内部控制要素中的()。
请用不超过200字的篇幅,概括出给定材料所反映的主要问题。要求:全面,有条理,有层次。从政策制定的角度,提出解决给定资料所反映问题的对策建议。要求:有针对性,有条理,切实可行。字数不超过350字。
AwaronsugarhasbegunintheUKthatechoesthenation’ssuccessfulcampaignagainstsalt.Theeffortis【C1】______becauseit
计算机能直接执行的程序是
有如下程序.#includeusingnamespacestd;classA{public:virtualvoidfuncl(){cout
最新回复
(
0
)