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
46
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] (33)
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
edge
解析
转载请注明原文地址:https://tihaiku.com/zcyy/2823845.html
相关试题推荐
DemandsforstrongerprotectionforwildlifeinBritainsometimeshidethef
Researchersdisagreewhetherthe"useitorloseit"philosophyholdsforco
Researchersdisagreewhetherthe"useitorloseit"philosophyholdsforco
Researchersdisagreewhetherthe"useitorloseit"philosophyholdsforco
Researchersusedtobelievethatasenseofrealcaringaboutotherscameas
Researchersusedtobelievethatasenseofrealcaringaboutotherscameas
Researchersusedtobelievethatasenseofrealcaringaboutotherscameas
ResearchersreportthatobesityrelatestoDNA.Somechildrengetobese【C1】_
ResearchersreportthatobesityrelatestoDNA.Somechildrengetobese【C1】_
ResearchersreportthatobesityrelatestoDNA.Somechildrengetobese【C1】_
随机试题
Whenwetalkaboutintelligence,wedonotmeantheabilitytogetgoodscore
Forthispart,youareallowed30minutestowriteashortessayentitledOn
Forgetfit,tannedandsporty—thenewgenerationofAustraliansisfastbec
Rumoristhemost【C1】_____wayofspreadingstories—bypassingthemonfro
A公司为非上市公司,按年对外提供财务报告,有关股票投资业务如下(所得税税率为25
羊膜腔胎儿造影不能诊断的胎儿畸形是A.小耳症 B.单眼症 C.白化病 D.
A.水蛭 B.红花 C.血竭 D.益母草 E.川芎皆能活血调经,利水的药
语文教学中要恰当运用多种评价方式,下列做法不正确的是()。A.形成性评价和终结性
惠普金融的发展目标不包括( )。A.提高金融覆盖率 B.完善金融体系 C.提
关于定价增发操作流程,假设T日为网上网下申购日,下列说法中正确的有()。A:T-
最新回复
(
0
)