首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
专升本
For many years, scientists couldn’t figure out how atoms and molecules(分子)on the Earth combined to make living things. Plants, f
For many years, scientists couldn’t figure out how atoms and molecules(分子)on the Earth combined to make living things. Plants, f
admin
2016-10-25
80
问题
For many years, scientists couldn’t figure out how atoms and molecules(分子)on the Earth combined to make living things. Plants, fishes, dinosaurs(恐龙), and people are made of atoms and molecules, but they are put together in a more complicated way than the molecules in the primitive ocean. What’s more, living things, that have energy and can reproduce on the Earth four billion years ago were lifeless.
After years of study, scientists figured out that living things, including human bodies, are basically made of amino acids and nucleotide(氨基酸与核苷酸)bases. These are molecules with millions of hydrogen(氢), carbon(碳), nitrogen(氮), and oxygen atom. How could such complicated molecules have been formed in the primitive soup? Scientists were stumped(难住).
Then, in 1953, two scientists named Harold Urey and Stanley L. Miller did a very simple experiment to find out what had happened on the primitive Earth. They set up some tubes and bottles in a closed loop(线圈), and put in some of the same gases that were present in the atmosphere four billion years ago: water vapor, carbon dioxide(二氧化碳), methane(甲烷), and hydrogen.
Then they shot an electric spark through the gases to simulate(模拟)bolts(闪电)of lightning on the ancient Earth, circulated the gases through some water, sent them back for more sparks, and so on. After seven days, the water that the gases had been bubbling(起跑)through had turned brown. Some new chemicals were dissolved in it . When Miller and Urey analyzed the liquid, they found that it contained amino acids—the very kind of molecules found in all living things.
According to the writer, living things on the Earth include______.
选项
A、atoms and molecules
B、chemicals
C、plants, fish, dinosaurs and human beings
D、the primitive soup
答案
C
解析
文中第一段第二句话暗示了该题的答案Plants,fish,dinosaurs,andpeople are made of atoms and molecules.所以C为正确答案。
转载请注明原文地址:https://kaotiyun.com/show/ZVHC777K
本试题收录于:
英语题库普高专升本分类
0
英语
普高专升本
相关试题推荐
Therearemanyfactorswhichmayhaveaninfluenceonadultsandchildrenbeingabletoleadahealthylife.Nowadays,peopl
Somepeoplemaylooklazywhiletheyarereallythinking,planningandresearching.Weshouldallrememberthatgreatscientific
Aroundtheworldmoreandmorepeoplearetakingpartindangeroussportsandactivities.Ofcourse,therehavealwaysbeenpeop
WeAmericansdoalotofbusiness______lunch,butpeoplehereprefertotellstories.
Americansocietyisnotnap(午睡)friendly.Infact,saysDavidDinges,asleepspecialistattheUniversityofPennsylvaniaSchool
Mostepisodesofabsent-mindedness-forgettingwhereyouleftsomethingorwonderingwhyyoujustenteredaroom—arecausedbya
74Inrecentyearsanewandseriousproblemhasarisenforinternationalairlinesandtheirpassengers.Thisistherelatively
74Inrecentyearsanewandseriousproblemhasarisenforinternationalairlinesandtheirpassengers.Thisistherelatively
MostAmericanpeoplehaterepeatingthesameworkendlessly,especiallythosewholiveintheWestAmerica.Theytrytheirbest
1.号召大学生为希望工程捐款。2.捐助希望工程的意义。3.捐助活动的时间和地点。
随机试题
统计调查的常用方式有()
A.X线颈椎平片B.肌电图C.痛温觉与触觉分离D.MRI有助于鉴别脊髓型颈椎病与髓内肿瘤的检查方法是
下列哪项是错误描述()
A.盈利性互联网药品交易服务B.非盈利性互联网药品交易服务C.经营性互联网药品信息服务D.非经营性互联网药品信息服务根据《互联网药品信息服务管理办法》通过互联网向上网用户无偿提供公开的、共享性药品信息服务活动,属于
哪种账户可用于支付工资及奖金()。
有下列()行为之一,尚不构成犯罪的,应依法给予治安管理处罚。
教学设计应该最先考虑的是教学目标设计。()
现代企业制度的内容有()。
根据婚姻法的有关规定,无过错方无权主张离婚损害赔偿请求的是()。
下列试题基于以下题干:某岛上的男性公民分为骑士和无赖。骑士只讲真话,无赖只讲假话。骑士又分为贫穷的和富有的两部分。有一个姑娘,她只喜欢贫穷的骑士,一个男性公民只讲了一句话,使得这姑娘确信他是一个贫穷的骑士。另外,姑娘问任何一个男性公民一个问题,根据回答就
最新回复
(
0
)