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
39
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
TheschoolsystemofreachingforAsunderliesthiscountry’sculture,which
Overthepastdecade,DINK(DoubleIncomesNoKids)hasbeenalifestyl
Thedebateoverwhetherdogsorcatsmakebetterpetswasgivenanewdimensi
Everylivingthinghaswhatscientistscallabiologicalclockthatcontrols
[originaltext]W:Nowyou’veseenthistableoffiguresaboutthepocketmoneyc
可用于治疗久咳、失音的药物是A.诃子B.苏子C.白芥子D.罂粟壳E.川贝母
信息加工的一般过程:确立加工目标;对收集的信息进行判别、筛选、分类、排序、分析和
根据《中华人民共和国民法通则》的规定,下列委托代理权可以终止的情形是()。A.代
对于集团财务报表审计,下列各项因素中,集团项目组在确定对组成部分财务信息拟执行的
张某购买的一张不记名预付卡已超过有效期,但尚有资金余额。下列表述中,正确的是()
最新回复
(
0
)