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
13
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] (35)
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
We know that what we now call Antarctica was once connected to both South America and Australia
解析
转载请注明原文地址:https://www.tihaiku.com/zcyy/2823847.html
相关试题推荐
Sometimes,anoldstorycouldbesomeaningfulthatpeoplecanlearnalotfrom
Sometimes,anoldstorycouldbesomeaningfulthatpeoplecanlearnalotfrom
Sometimes,anoldstorycouldbesomeaningfulthatpeoplecanlearnalotfrom
Sometimes,anoldstorycouldbesomeaningfulthatpeoplecanlearnalotfrom
Sometimes,anoldstorycouldbesomeaningfulthatpeoplecanlearnalotfrom
Sometimes,anoldstorycouldbesomeaningfulthatpeoplecanlearnalotfrom
【B1】[br]【B2】A、stillB、evenC、sometimesD、oftenB
[originaltext]Mensometimessay:"Wearebetterandclevererthanwomen.Wo
[originaltext]Proverbs,sometimescalledsayings,areexamplesoffolkwisd
[originaltext]Proverbs,sometimescalledsayings,areexamplesoffolkwisd
随机试题
[originaltext]W:Mr.Stern,mayIaskyou?Doyouthinkitwasnecessaryandfa
Thelossescausedbytheflood______(估计超过了政府的预期).areestimatedtohaveexceeded
工作进度进展、资源使用情况属于管理项目工作输出的哪项内容()。A.可交付成果
68岁,男性,糖尿病10年,昏迷2天入院。血压21/11kPa(157.5/82
以业绩报酬机制为核心的()通常成为募集谈判的重要条款,可能包括收益分配方式、门
Thechangeinthatvillagewasmiraculou
患者女性,46岁。诊断为卵巢癌,伴右侧胸腔积液形成,最可能的组织类型是A.卵巢纤
患者症见心烦不寐,遗精多梦,头晕耳鸣,脉细数属于( )。A.心阴虚 B.肝阴
大脑皮质中的角回主管()。 (A)说话(B)阅读 (C)听话(D)书写
A.Roger病 B.动脉导管未闭 C.法洛四联症 D.房间隔缺损 E.
最新回复
(
0
)