首页
登录
职称英语
Sometimes the biggest finds are the smallest finds. Researchers examining a(
Sometimes the biggest finds are the smallest finds. Researchers examining a(
游客
2023-07-10
27
管理
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)______ [br] (26)
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
segment
解析
转载请注明原文地址:https://tihaiku.com/zcyy/2823838.html
相关试题推荐
[originaltext]Proverbs,sometimescalledsayings,areexamplesoffolkwisd
Researchersdisagreewhetherthe"useitorloseit"philosophyholdsforco
Researchersdisagreewhetherthe"useitorloseit"philosophyholdsforco
Researchersdisagreewhetherthe"useitorloseit"philosophyholdsforco
Researchersusedtobelievethatasenseofrealcaringaboutotherscameas
Researchersusedtobelievethatasenseofrealcaringaboutotherscameas
Researchersusedtobelievethatasenseofrealcaringaboutotherscameas
Sometimeschildrenhavetrouble____________(把事实和想像区分开来)andmaybelievethats
ResearchersreportthatobesityrelatestoDNA.Somechildrengetobese【C1】_
ResearchersreportthatobesityrelatestoDNA.Somechildrengetobese【C1】_
随机试题
[originaltext]W:Tom.Whatareyougoingtodoaftergraduation?M:(17)Iplan
Grandfatherhadsustainedabrokenbackwhileworkinginthemines.______,hesp
Inthemidstofaperiodofrapidlanguageextinction,withalanguageestim
TheriseoftheInternethasbeenoneofthemosttransformativedevelopment
不受醛固酮控制的是()。A.钠离子 B.氯离子 C.水 D.钾离子 E
建筑物层高小于等于( )米时,每两层设置一道均压环。 A、3 B、3.5
疣状赘生物是指 A.心内膜增生物B.心内膜上的新生物C.心瓣膜纤维化 D.心
消化性溃疡抗H.pylori的四联疗法正确的是()A.兰索拉唑+阿莫西林+克拉
(2020年真题)郑某为支付甲公司货款,向银行申请签发了一张金额为60万元的
为了应对风险接受,可以采取事先制订好后备措施。一旦项目实际进展情况与计划不同,就
最新回复
(
0
)