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
2015-03-13
78
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/uiUC777K
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
Youngcollegegraduates,whohavejustfoundjobs,need______toprovethemselves.
Environmentalgroupsintendto______thepressureuntilthegovernmentchangesthelaw.
Whatshouldyouthinkaboutwhentryingtofindyourcareer?Youareprobablybetteratsomeschoolsubjectsthanothers.These
YouwillhavenodifficultyinmakingcontactwiththeAgent.Asyouenterhisoffice,youwillbegreetedimmediatelyandpolit
Thehappytimewithmygirlfriendwasreally______(forget).
A.We’vetakenstepstoensurethatitwon’thappenagain.B.BeingspecializedintheexportofChineseartandcraftgoods,we
Intheyear2100,theworldisgoingtohaveapopulationofabout8billion.Mostscientistsagreethatthemostsevereproblem
Traditionally,theAmericanfarmerhasalwaysbeenindependentandhard-working.Intheeighteenthcenturyfarmerswerequite
Solarcellshavebeendevelopedprimarilyto______electricpowerforspacecraft
随机试题
Sorry,Ididn’tknow______Dr.Smithhasalreadyreturnedfromhisholiday.I’11goandseehiminaminute.
属于一类动物疫病的是
患者,男性,34岁。测量血压,血压值为132/88mmHg,属于
法院在审理一起抢夺案时,发现被告人朱某可能有自首情节,但起诉书和移送材料中没有相关证据材料。关于法院应当如何处理,下列哪一选项是正确的?()
道路施工现场路基压实度检测可采用的方法有()。
法的实施的基本方式包括()。
阅读下面的短文,回答以下问题。“美”字的来源,是“羊大为美”。《说文》对美的注释是“甘也。从羊从大,羊在六畜,主给膳也”,美来源于好吃、味美。孔子的“君子成人之美”,把美与善、美与满足混在一起,他听到韶乐,三月不知肉味即是例证。大哲学家庄子,对美
奥斯曼土耳其帝国中。赏赐给伊斯兰清真寺的土地称为()。
一次运动会,A班参加人数和B班参加人数之比为5:4,C班参加人数和D班参加人数之比为25:9,A班参加人数与D班参加人数之比为10:3,如果C班参加人数有50人,则/4班参加人数有
互联网借助TCP/IP协议把许多同构或异构的计算机网络互相连接起来,实现了遍布全球的计算机的互连、互通和互操作,其中的IP协议起着关键性的作用。下面有关IP协议的叙述中,错误的是()。
最新回复
(
0
)