首页
登录
职称英语
A fossil recently discovered in Marlandia, a chain of islands, proves that a pre
A fossil recently discovered in Marlandia, a chain of islands, proves that a pre
游客
2025-02-25
34
管理
问题
A fossil recently discovered in Marlandia, a chain of islands, proves that a present-day reptile indigenous to Marlandia is descended from an ancient reptile species that lived on the islands millions of years ago. The finding is surprising since the ancestral species was thought to have become extinct when Marlandia was submerged in a global sea-level rise twenty-five million years ago. Based on the new discovery, many scientists have concluded that the sea-level rise in question left at least part of Marlandia unsubmerged.
Which of the following would, if true, provide the most additional support for the scientists’ conclusion?
选项
A、Reptiles in Marlandia have adapted to many environmental changes since the sea-level rise.
B、Marlandia separated from a much larger landmass about eighty million years ago.
C、No fossils that prove the relationship between the present-day species and the ancestral species have been found anywhere other than Marlandia.
D、The present-day reptiles are able to thrive on very tiny Marlandia islands.
E、The ancestral reptiles could not have survived long at sea.
答案
E
解析
This question requires that we identify the answer choice that lends the most support for the scientists’ conclusion. This conclusion states that the islands of Marlandia must not have been completely submerged during a global rise in sea level as had previously been thought.
Scientists arrived at this conclusion after being surprised to find that a present-day reptile indigenous to Marlandia is descended from an ancient reptile species that lived on the islands millions of years ago. They had believed that this prehistoric species had become extinct millions of years ago when Marlandia was submerged due to a global rise in sea level.
What are some ways that we can strengthen support for the conclusion? Information that rules out the possibility that the reptile could have survived even if the islands had been completely submerged would strengthen support. So would information that rules out the possibility that the reptile had migrated to somewhere other than Marlandia but traveled back to Marlandia after the islands were no longer submerged.
A Even if it is true that reptiles on Marlandia have adapted to environmental changes since the sea-level increase, that does not support the belief that part of Marlandia never became submerged when the sea level rose. It does not rule out either of the two alternative explanations discussed immediately above, for instance.
B The arguments conclusion is about whether some part of Marlandia never became submerged. Information indicating that Marlandia separated from a much larger landmass many millions of years before the global sea-level rise is not relevant to that conclusion.
C It might seem that this choice supports the conclusion. If the ancestral species never lived anywhere other than Marlandia, then the present-day species could not have descended from this ancestral species elsewhere and only later, after the sea-level rise, migrated to Marlandia. That would help rule out an alternative explanation of how the present-day species survived the global sea-level rise. However, note that all we are told is that no fossils have been found anywhere other than Marlandia. Simply because no such fossils have yet been found does not indicate that these ancestral species
never existed elsewhere. Fossils are often deeply buried and hard to find. After all, the fossils on Marlandia that are discussed in the argument were only recently found; perhaps other such fossils will soon be found elsewhere. Thus, this answer choice does not support the conclusion.
D This does not provide any particular support for the argument. Note that it is not the present-day reptile species that is presumed to have survived on Marlandia when sea levels rose. Rather, it is the ancestral species that is presumed to have survived.
E Correct. This rules out that the ancestral species could have survived the sea-level rise simply by living at sea. It also reduces the possibility that the ancestral species had also lived elsewhere than Marlandia and had only later—after the sea-level rise—migrated to Marlandia.
The correct answer is E.
转载请注明原文地址:http://tihaiku.com/zcyy/3971623.html
相关试题推荐
FirstdiscoveredseveralyearsagoinNorthAmericanlakesandrivers,thenorth
Untilrecently,scrutinyoftree-ringrecordsseemedtoestablishthat
A、Astarisdiscoveredthatemitslowerlevelsoftraceionsthanthosediscover
Performingrotememoryexercisesrarelyimprovesthe______ofanygivensubject
A、Throughcarefulanddocumentedstudy,cloningprovestobelessriskythancon
Untilrecently,scrutinyoftree-ringrecordsseemedtoestablishth
Untilrecently,scrutinyoftree-ringrecordsseemedtoestablishth
Untilrecently,scrutinyoftree-ringrecordsseemedtoestablishth
Inthenewlydiscoveredgene,thechangeofasingleunitofDNAconvertsthewo
Recently,agroupofresearchersfromTokyodevelopedadevicethatallowsthem
随机试题
Duringrecentyearswehaveheardmuchabout"race":howthisracedoescert
Shynessisthecauseofmuchunhappinessforagreatmanypeople.Shypeople
ExaminationshavealongerhistoryinChinathaninanyothercountry,yetitis
Intheviewoftheprimatologist(灵长类动物学家)SarahBlafferHrdy,theextraordi
关于基金的份额拆分,以下说法正确的()。A.基金可以通过份额拆分突破合格投资者额
组合场占用面积少,便于组件的吊装;但钢材耗用量大,安全状况较差的锅炉受热面组合形
研究化学的配伍变化中,不易观察到的情况有A.沉淀 B.产气 C.变色 D.
某9层钢结构办公建筑,房屋高度H=34.9m,抗震设防烈度为8度,布置如题24-
下列有助于诊断的实验室检查是() A.白细胞分类 B.血沉 C.血培养
为了限制短路电流,在电力系统可以采取下列哪几项措施?()A.提高电力系统的电压
最新回复
(
0
)