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
8
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] (29)
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
protected
解析
转载请注明原文地址:https://www.tihaiku.com/zcyy/2823841.html
相关试题推荐
[originaltext]Proverbs,sometimescalledsayings,areexamplesoffolkwisd
[originaltext]Proverbs,sometimescalledsayings,areexamplesoffolkwisd
Researchersdisagreewhetherthe"useitorloseit"philosophyholdsforco
Researchersdisagreewhetherthe"useitorloseit"philosophyholdsforco
Researchersdisagreewhetherthe"useitorloseit"philosophyholdsforco
Researchersusedtobelievethatasenseofrealcaringaboutotherscameas
Sometimeschildrenhavetrouble____________(把事实和想像区分开来)andmaybelievethats
ResearchersreportthatobesityrelatestoDNA.Somechildrengetobese【C1】_
ResearchersreportthatobesityrelatestoDNA.Somechildrengetobese【C1】_
ResearchersreportthatobesityrelatestoDNA.Somechildrengetobese【C1】_
随机试题
Hedoesn’tdaretoleavethehouse______(惟恐被别人认出来).forfearthathe(should)bere
患儿,男,3岁,因腹泻收入院。护士将测得体温记录在体温单上,下述正确的是 A.
下列关于算术平均收益率和几何平均收益率的说法错误的是()A.几何平均收益率运用
数字表中第4列四个数字之和所得结果对应的符号是:A.EH B.¥*
根据上述表中数据,下列说法错误的是()。A.上海市各区、县中,面积最小
某寒冷地区综合楼,地上8层,地下1层,地上地下层高均为5m,每层建筑面
材料一:党的十八大以来,中央制定立体式、全方位的厉行节约反对浪费的制度体系,逢节
基础心理学是研究()。 (A)正常成人心理现象的心理学基础学科 (B
(2021年真题)抑制尿酸生成的抗痛风药物是()A.双氯芬酸 B.秋水仙
下列不属于嵌锁型粒料路面基层结构的是()。A.填隙碎石基层 B.泥结碎石
最新回复
(
0
)