首页
登录
职称英语
Hitherto, there is no evidence yet that would definitively prove whet
Hitherto, there is no evidence yet that would definitively prove whet
游客
2024-01-11
46
管理
问题
Hitherto, there is no evidence yet that would definitively prove whether or
not some dinosaurs were warm-blooded, but scientists have begun to investigate
oxygen isotopic abundances in the annual growth bands of teeth or bones of high
Line latitude, hence seasonally influenced, terrestrial dinosaurs. The ratio of oxygen
(5) isotopes depends on temperature, and an absence of seasonal variations in
oxygen 18—a heavy version of the common oxygen 16 atom-would strongly
suggest that the animals maintained a constant internal temperatures. Such a
finding would not, however, constitute "proof" that dinosaurs were warm
blooded, as there are external mechanisms that cold-blooded animals employ to
(10) regulate body temperatures and thereby influence metabolic rates. More
nettlesome is that proof would have to come from discovery of intact dinosaur
remains in which the soft tissue had not been replaced or altered, and from
which the biomolecules responsible for thermoregulation could be extracted,
identified and characterized. Such a proof is unlikely, as it would require an
(15) almost impossible level of preservation over 65 million years, plus the advent of
biotechnology that does not yet exist. [br] The passage suggests which of the following about the hypothetical discovery of an absence of seasonal variations in oxygen 18 molecules? Ⅰ. It would not prove that certain dinosaurs were capable of regulating their temperatures internally. Ⅱ. One likely source of such a discovery would come from annual growth bands of dinosaur teeth. Ⅲ. The fact that no biotechnology yet exists to elucidate thermoregulation biochemistry proves such a discovery is impossible. Ⅳ. The discovery would be profound, because oxygen 18 is only found in fossil records where there is seasonal variation.
选项
A、Ⅰ and Ⅱ only
B、Ⅱ and Ⅲ only
C、Ⅲ and Ⅳ only
D、Ⅰ and Ⅳ only
E、Ⅱ, Ⅲ, and Ⅳ only
答案
A
解析
转载请注明原文地址:https://tihaiku.com/zcyy/3353672.html
相关试题推荐
Thereisampleevidence,derivedfromtheloreoftraditionalfolkmedicine,tha
Thereissubstantialevidencethatcertainformsofsolarenergyeithernoworw
Promotedbynewevidencethatthehealthriskposedbyradongasisfarmoreser
Thelobbyistsarguedthatbecausethereisnostatisticalevidencethatbreathin
A、Warereliesuponadifferentbodyofevidencethanpreviousanthropologisthav
A、Thesecondparagraphreliesondifferentevidenceindrawingaconclusionsimi
Hitherto,thereisnoevidenceyetthatwoulddefinitivelyprovewhether
A、AnassumptionbasedonevidencealreadypresentedB、Aconcessiontotheviewo
Themostcompellingevidenceoftherisksofcarcinogeniceffectsof
Themostcompellingevidenceoftherisksofcarcinogeniceffectsof
随机试题
EachofQuestions1to7presentstwoquantities.QuantityAandQuantityB.Com
[originaltext]Atfirst,mostAmericansdidn’tthinktherewasanythingpart
[originaltext]W:Peopleinallpartsoftheworldareobserving"NoTobaccoDay
唐诗代表着中国古代诗歌发展的最高峰。其中被誉为唐诗的“双子星座”,代表我国古典诗
房屋实物状况建筑规模的查看内容中,相关的房屋面积不包括( )。A.建筑面积
关于生物课程标准与教材的叙述,不正确的是()。A.一个版本的教材很难完全适合全
可治疗胃脘冷痛的药物有A.小茴香 B.丁香 C.干姜 D.肉桂
下列关于简单收益率与时间加权收益率无系的表述,正确的是()。A:简单收益率与时间
如果银行向一个处于并购过程中的公司提供可展期的短期贷款,由于期限短,不需要特别关
下列关于增值税发票开具规定的表述中,正确的有()。A.增值税小规模纳税人需
最新回复
(
0
)