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
2024-02-11
42
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] (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://tihaiku.com/zcyy/3440112.html
相关试题推荐
Sometimes,anoldstorycouldbesomeaningfulthatpeoplecanlearnalotfrom
Sometimes,anoldstorycouldbesomeaningfulthatpeoplecanlearnalotfrom
Sometimes,anoldstorycouldbesomeaningfulthatpeoplecanlearnalotfrom
Sometimes,anoldstorycouldbesomeaningfulthatpeoplecanlearnalotfrom
Sometimes,anoldstorycouldbesomeaningfulthatpeoplecanlearnalotfrom
Sometimes,anoldstorycouldbesomeaningfulthatpeoplecanlearnalotfrom
TheChannelTunnelisoneofthebiggestengineeringprojectsever______.A、unde
[originaltext]Mensometimessay:"Wearebetterandclevererthanwomen.Wo
Problemswithchildcareremainthebiggest______towomensucceedingatwork.A、
[originaltext]Proverbs,sometimescalledsayings,areexamplesoffolkwisd
随机试题
Everyoneaboardtheship______whenitsankoffthecoastofMaine.A、nourished
Musicians—fromkaraokesingerstoprofessionalcelloplayers—arebetter
[originaltext]M:Goodafternoon,canIhelpyou?W:Yes.I’mhereforanappoin
C
用来反映公共卫生监测系统识别公共卫生问题能力的是()。A.及时性 B.简便
A.1% B.0.1% C.3% D.0.5% E.2%用于消毒口腔及皮
比对是在规定的条件下,对相同类型的准确度等级或指定不确定度范围的同种测量仪器复现
某简易计税包工包料工程编招标控制价,地下一层,其含税分部分项工程费为500万元,
某电厂有两台排污泵(一用一备),安装在低于地面2m的泵房内,排污泵的工作介质温度
在运输机场开放使用的情况下,未经批准在( )内进行施工。按规定将由民航管理部门
最新回复
(
0
)