影音先锋制服丝袜_欧美 国产 日本_亚洲欧美综合自拍_亚洲最大成人在线观看_成人一区二区三_色呦呦网站入口_亚洲欧美高清在线_黄页网站在线看_一卡二卡在线观看_在线观看免费黄网站

精英家教網 > 高中英語 > 題目詳情

Scientists have many theories about how the universe ___ into being.

A. came                                     B. was coming

C. had come                               D. would come

A


解析:

考查時態的用法。宇宙是如何形成的,因為宇宙的形成這個動作已經發生,所以用一般過去時來表示已經發生的動作。

練習冊系列答案
相關習題

科目:高中英語 來源: 題型:閱讀理解

Batteries can power anything from small sensors to large systems. While scientists are finding ways to make them smaller but even more powerful, problems can arise when these batteries are much larger and heavier than the devices themselves. University of Missouri(MU) researchers are developing a nuclear energy source that is smaller, lighter and more efficient.

“To provide enough power, we need certain methods with high energy density(密度)”,said Jae Kwon, assistant professor of electrical and computer engineering at MU. “The radioisotope(放射性同位素) battery can provide power density that is much higher than chemical batteries.”

Kwon and his research team have been working on building a small nuclear battery, presently the size and thickness of a penny, intended to power various micro / nanoelectromechanical systems (M/NEMS). Although nuclear batteries can cause concerns, Kwon said they are safe.

“People hear the word ‘nuclear’ and think of something very dangerous,” he said, “However, nuclear power sources have already been safely powering a variety of devices, such as pace-makers, space satellites and underwater systems.”

His new idea is not only in the battery’s size, but also in its semiconductor(半導體). Kwon’s battery uses a liquid semiconductor rather than a solid semiconductor.

“The key part of using a radioactive battery is that when you harvest the energy, part of the radiation energy can damage the lattice structure(晶體結構) of the solid semiconductor,” Kwon said, “By using a liquid semiconductor, we believe we can minimize that problem.”

Together with J. David Robertson, chemistry professor and associate director of the MU Research Reactor, Kwon is working to build and test the battery. In the future, they hope to increase the battery’s power, shrink its size and try with various other materials. Kwon said that battery could be thinner than the thickness of human hair.

Which of the following is true of Jae Kwon?

A. He teaches chemistry at MU.

B. He developed a chemical battery.

C. He is working on a nuclear energy source.

D. He made a breakthrough in computer engineering.

Jae Kwon gave examples in Paragraph 4_________.

A. to show chemical batteries are widely applied.

B. to introduce nuclear batteries can be safely used.

C. to describe a nuclear-powered system.

D. to introduce various energy sources.

Liquid semiconductor is used to _________.

A. get rid of the radioactive waste

B. test the power of nuclear batteries.

C. decrease the size of nuclear batteries

D. reduce the damage to lattice structure.

According to Jae Kwon, his nuclear battery _______.

A. uses a solid semiconductor

B. will soon replace the present ones.

C. could be extremely thin

D. has passed the final test.

The text is most probably a ________.

A. science news report  B. book review

C. newspaper ad    D. science fiction story

PART FOUR   WRITING (45%)

查看答案和解析>>

科目:高中英語 來源: 題型:

The fact has worried many scientists ______ the earth is becoming warmer and warmer these years.

A. what          B. which         C. that       D. though

查看答案和解析>>

科目:高中英語 來源: 題型:閱讀理解

    People diet to look more attractive. Fish diet to avoid being beaten up, thrown out of their social group, and getting eaten as a result. That is the fascinating conclusion of the latest research into fish behavior by a team of Australian scientists.

The research team have discovered that subordinate fish voluntarily diet to avoid challenging their larger competitors. “In studying gobies we noticed that only the largest two individuals, a male and female, had breeding(繁殖) rights within the group," explains Marian Wrong. “All other group members are nonbreeding females, each being 5-10% smaller than its next largest competitor. We wanted to find out how they maintain this precise size separation."

The reason for the size difference was easy to see. Once a subordinate fish grows to within 5-10% of the size of its larger competitor, it causes a fight which usually ends in the smaller goby being driven away from the group. More often than not, the evicted fish is then eaten up.

It appeared that the smaller fish were keeping themselves small in order to avoid challenging the boss fish. Whether they did so voluntarily, by restraining how much they ate, was not clear. The research team decided to do an experiment. They tried to fatten up some of the subordinate gobies to see what happened. To their surprise, the gobies simply refused the extra food they were offered, clearly preferring to remain small and avoid fights, over having a feast.

 The discovery challenges the traditional scientific view of how boss individuals keep their position in a group. Previously it was thought that large individuals simply used their weight and size to threaten their subordinates and take more of the food for themselves, so keeping their competitors small.

While the habits of gobies may seem a little mysterious. Dr. Wong explains that understanding the relationships between boss and subordinate animals is important to understanding how hierarchical(等級的) societies remain stable.

The research has proved the fact that voluntary dieting is a habit far from exclusive to human.”As yet, we lack a complete understanding of how widespread the voluntary reduction of food intake is in nature," the researchers comment. “Data on human dieting suggests that, while humans generally diet to improve health or increase attractiveness, rarely does it improve long-term health and males regularly prefer females that are fatter than the females' own ideal."

65 When a goby grows to within 5-10% of the size of its larger competitor, it ______.

A. faces danger       B. has breeding rights

C. eats its competitor     D. leaves the group itself

66. The underlined words “the evicted fish" in Paragraph 3 refer to _____.

A. the fish beaten up       B. the fish found out

C. the fish fattened up     D. the fish driven away

67 The experiment showed that smaller fish ____.

A. fought over a feast        B. went on diet willingly

C. preferred some extra food  D. challenged the boss fish

68. What is the text mainly about?

A. Fish dieting and human dieting.

B. Dieting and health.

C. Human dieting.

D. Fish dieting. 

查看答案和解析>>

科目:高中英語 來源: 題型:閱讀理解

What makes a person a scientist? Does he have ways or tools of learning that are different from those of others??The answer is“no”.It isn't the tools a scientist uses but how he uses these tools which makes him a scientist .You will probably agree that knowing how to use a power is important to a carpenter(木匠).You will probably agree,too, that knowing how to investigate(調查),how to discover information ,is important to everyone. The scientist ,however ,goes one step further ;he must be sure that he has a reasonable answer to his questions and that his answer he gets to many questions is into a large set of ideas about how the world works.?

The scientist's knowledge must be exact .There's no room for half right or right just half the time. He must be as nearly right as the conditions permit .What works under one set of conditions at one time must work under the same conditions at other times. If the conditions are different ,any changes the scientist observes in a demonstration(實證)must be explained by the changes in the conditions. This is one reason why investigations are important in science .Albert Einstein ,who developed the Theory of Relativity ,arrived at this theory through mathematics. The accuracy(正確性)of his mathematics was later tested through investigation. Einstein's ideas were proved to be correct .A scientist uses many tools for measurements .Then the measurements are used to make mathematical calculations(計算)that may test his investigations.

1.What makes a scientist according to the passage??

A.The tools he uses.

B.His ways of learning.?

C.The way he uses his tools.

D.The various tools he uses.?

2.“...knowing how to investigate ,how to discover information ,is important to everyone.”The writer says this to show_______.?

A.the importance of information

B.the difference between scientists and ordinary people?

C.the importance of thinking

D.the difference between carpenters and ordinary people?

3.A sound scientific theory should be one that_______.?

A.works under one set of conditions at one time and also works under the same conditions at other times?

B.leaves no room for improvement?

C.doesn't allow any change even under different conditions?

D.can be used for many purposes?

4.What is the main idea of the passage??

A.Scientists are different from ordinary people.?

B.The Theory of Relativity.?

C.Exactness is the core(核心)of science.?

D.Exactness and way of using tools are the keys to making of a scientist.?

 

查看答案和解析>>

科目:高中英語 來源:2012-2013學年河北省邢臺一中高二第三次月考英語試卷(帶解析) 題型:單選題

Nowadays,scientists are working hard to find a best way of treating addictions ________ drugs.

A.ofB.inC.onD.to

查看答案和解析>>

同步練習冊答案
中文字幕在线观看免费| 日韩av网站在线播放| 日本中文字幕网| av动漫在线播放| 亚洲一区二区三区三州| 伊人365影院| 一卡二卡三卡视频| 国产老头和老头xxxx×| 亚洲天堂日韩av| 极品美女扒开粉嫩小泬| 中文字幕av网址| 国产三级在线观看视频| 国产福利视频在线播放| 无码人妻丰满熟妇啪啪欧美| 中文字字幕在线中文乱码| 欧在线一二三四区| 51精品免费网站| 91丨porny丨九色| 特级西西444www高清大视频| 9久久婷婷国产综合精品性色| 国产黄色片在线| 能看毛片的网站| 中文字幕网址在线| 免费看a级黄色片| 国产3级在线观看| 绯色av蜜臀vs少妇| 一本到在线视频| 欧美黄色免费看| 先锋影音男人资源| 泷泽萝拉在线播放| 日本免费一区视频| 中文av免费观看| 久草网视频在线观看| 日韩精品―中文字幕| 国产精品18在线| 久久久久国产免费| 超碰在线观看99| 国产成人一级片| 国模杨依粉嫩蝴蝶150p| 中文字幕在线乱| ass极品国模人体欣赏| 日本女人黄色片| 久久久久久91亚洲精品中文字幕| 亚洲77777| 国产精品丝袜久久久久久消防器材| 日本 欧美 国产| 在线观看福利片| 初高中福利视频网站| 99热精品在线播放| 中文字幕永久在线视频| 亚洲国产成人精品激情在线| 午夜精品久久久久久久99热影院| 欧美一级在线看| 欧美高清中文字幕| 18视频在线观看娇喘| 嘿嘿视频在线观看| 中文字幕人妻一区二区三区在线视频| 男人的天堂免费| 欧美 日韩 国产 成人 在线| 国产又粗又猛又爽又黄视频| 亚洲大片免费观看| 黄色片网站在线免费观看| 欧美美女性视频| 五月婷婷六月合| 香蕉视频禁止18| 精品久久久久久久无码| 日韩 欧美 高清| 久久婷婷国产精品| 妺妺窝人体色www在线小说| 久久亚洲精品无码va白人极品| 97精品国产97久久久久久粉红| 中文字幕无码日韩专区免费 | 全程偷拍露脸中年夫妇| 日韩精品电影一区二区三区| 久久精品成人av| 国产精品无码一区二区三区| 久久精品国产亚洲av麻豆| 黄色a一级视频| 91网站免费视频| 欧美老女人性生活视频| jizz18女人高潮| 日韩欧美视频免费观看| 91视频综合网| 青草全福视在线| 欧美午夜性视频| 久久网站免费视频| 亚洲一二三区av| 涩涩网站在线看| 国产在线视频第一页| 97免费在线观看视频| 欧美一区免费看| 国产精品探花视频| 亚洲人视频在线观看| 免费啪视频在线观看| 五级黄高潮片90分钟视频| 长河落日免费高清观看| 91日韩中文字幕| 欧美视频在线观看网站| 妓院一钑片免看黄大片| 手机在线免费毛片| 黄色一级视频免费看| 国产精品久久婷婷| 宇都宫紫苑在线播放| 性色av蜜臀av色欲av| 永久免费未视频| 私库av在线播放| 国产不卡一区二区视频| 日日躁夜夜躁aaaabbbb| 日韩三级小视频| 日本中文字幕在线观看视频| 国产青青草视频| 五月天丁香社区| 人妻无码一区二区三区免费| 亚洲综合久久av一区二区三区| 国产黄色激情视频| 午夜免费福利在线| 手机在线看片1024| 搡老岳熟女国产熟妇| 久久精品成人av| 800av在线免费观看| 日本888xxxx| 五月天综合激情网| 日本精品一区二区在线观看| 久久性爱视频网站| 久草网站在线观看| 国产九九在线视频| 国产精品成人无码| 粉嫩av一区二区夜夜嗨| 国产熟女一区二区| 97超碰青青草| 影音先锋亚洲天堂| 熟妇人妻av无码一区二区三区| 久久久视频6r| 久久无码高潮喷水| 波多野结衣 久久| 无码人妻一区二区三区免费n鬼沢| 久久午夜精品视频| 久久久噜噜噜www成人网| 欧美色图亚洲天堂| 亚洲精品一区二区三区四区| 性欧美精品男男| 日韩在线xxx| 国产精品传媒在线观看| 国产免费一区二区三区最新6| www.-级毛片线天内射视视| 妺妺窝人体色www在线观看| 国产精品suv一区| 95视频在线观看| www.日本在线视频| 国产精品久久久久久久久久久久久久久久久 | 久久午夜鲁丝片| 无码国产69精品久久久久网站| 成人国产一区二区三区| 国产一级黄色av| 五十路在线观看| 日韩精品福利片午夜免费观看| 免费中文字幕视频| 亚洲欧美一区二区三| 国产奶头好大揉着好爽视频| 欧美少妇性生活视频| 黄色污污网站在线观看| 久久人人爽人人爽人人片 | 亚洲天堂网一区二区| 免费av手机在线观看| 一区二区xxx| 亚洲五码在线观看视频| 欧美老女人bb| 制服丝袜第一页在线观看| 国产51自产区| 免费黄色激情视频| 中文字幕手机在线视频| 日韩中文在线字幕| 亚洲精品成人电影| 日本阿v视频在线观看| 亚洲国产日韩在线一区| 日韩av影视大全| 萌白酱视频在线| 国产精品久久久久久久久久久久久久久久| 国产午夜手机精彩视频| 国产sm主人调教女m视频| 国产91对白刺激露脸在线观看| 特黄特色免费视频| 中日韩精品视频在线观看| 中国美女乱淫免费看视频| 日韩综合在线观看| 国产在线播放观看| 69亚洲乱人伦| 日本视频免费观看| 精品少妇一区二区三区在线| 国产在线a视频| 日韩精品成人一区| 男人天堂新网址| av天堂一区二区| 中文在线免费观看| 宅男噜噜噜66国产免费观看| 免费成人深夜夜行p站| 黄色一区二区视频| 亚洲精品视频导航| 色呦呦网站入口| 欧美一级片在线免费观看| 日本少妇毛茸茸高潮| 激情六月天婷婷| 国产艳妇疯狂做爰视频 | 国产男女猛烈无遮挡a片漫画 | 黑人巨大猛交丰满少妇| 日韩三级一区二区| 亚洲成色www.777999| 天天操天天干天天操天天干| 国产日韩免费视频| 九九九久久久久久久| 欧美男女爱爱视频| 国产综合精品在线| 亚洲第一色网站| 日本一级黄色录像| 黄色片一级视频| 香蕉视频在线网址| yy1111111| 国产情侣av在线| 国产精品第72页| 国产精品wwwww| 国产免费内射又粗又爽密桃视频| av漫画在线观看| 国产又粗又黄又爽视频| 人人爽人人爽av| 亚洲 自拍 另类小说综合图区| fc2成人免费视频| 精品黑人一区二区三区在线观看| 欧美精品videos极品| www污在线观看| 免费观看a级片| 小日子的在线观看免费第8集| 欧美激情亚洲综合| 国产九九九视频| 欧美在线观看成人| 国产免费无码一区二区视频| 国产 xxxx| 亚洲国产精品视频在线| 国产真实乱偷精品视频| 永久免费的av网站| 成人在线免费高清视频| 亚洲熟妇一区二区三区| 午夜影院免费体验区| 在线免费观看一级片| 欧美激情第一区| 在线免费av播放| 国产一区二区在线视频播放| 91大神福利视频| 欧美bbbbb性bbbbb视频| 天堂在线视频网站| 欧美一级视频免费观看| 91香蕉国产线在线观看| 久久九九国产视频| 黄色片网址在线观看| 四虎免费在线视频| xxxxxx黄色| 黄色国产在线视频| 在线精品视频播放| 少妇搡bbbb搡bbb搡打电话| 无码人妻一区二区三区在线视频| 亚洲男人第一天堂| 亚洲免费成人在线| 韩国av永久免费| 免费观看a视频| 天天操天天干天天操| 无码精品人妻一区二区三区影院| 免费看日韩av| 好吊操视频这里只有精品| www.四虎精品| 亚洲图片综合网| 好吊视频在线观看| 国产美女永久免费无遮挡| 国产精品亚洲无码| 欧美成人久久久免费播放| 战狼4完整免费观看在线播放版| 手机看片国产日韩| 欧美黑人性猛交xxx| 欧美aaa在线观看| 国产www免费| 成人一级片网站| 日本一二区免费| 精品无码久久久久久久| 日韩精品在线免费看| 日本熟女毛茸茸| 一级黄色片在线观看| 国产高潮流白浆喷水视频| 亚洲男人第一天堂| 色悠悠在线视频| 免费看91的网站| 欧美激情精品久久久久久免费| 五月婷婷一区二区三区| 国产 欧美 日韩 一区| 男人操女人免费软件| 在线观看岛国av| 久久久国产高清| 国产精品久久777777换脸| www.五月天激情| 亚洲国产精品第一页| 亚洲自拍偷拍图| 成人免费看片视频在线观看| 欧美 丝袜 自拍 制服 另类| 在线观看的毛片| 亚洲男人的天堂在线视频| 中文字幕 自拍偷拍| 免费激情视频网站| 风间由美一二三区av片| 国产又色又爽又高潮免费| 欧洲金发美女大战黑人| 91看片就是不一样| 欧美日韩国产精品综合| 中文字幕你懂的| 久久发布国产伦子伦精品| 在线观看国产精品一区| 国产又粗又大又爽的视频| 国产美女在线一区| 成人性生交视频免费观看| 五月天婷婷导航| 熟妇人妻一区二区三区四区| 白白色免费视频| 国产情侣第一页| 99九九精品视频| 在线免费一级片| 日本不卡视频一区| 玖玖爱这里只有精品| 久久久久久久久久久久久国产精品| 久久精品www| 999av视频| 国产交换配乱淫视频免费| 肉大捧一出免费观看网站在线播放 | 国产黄色小视频网站| 欧美黑人经典片免费观看| 久久久久久久久久99| 91影院在线播放| 疯狂揉花蒂控制高潮h| 男人日女人的bb| 麻豆91精品91久久久| 91麻豆成人精品国产| www.日本高清| 国产人妻777人伦精品hd| 中文字幕第28页| 香蕉视频黄色片| 国产又黄又爽免费视频| 亚洲综合日韩欧美| 91亚洲国产成人久久精品麻豆| 黑丝av在线播放| 日韩在线一级片| 日本黄色一级视频| 中文字幕在线观看网址| 9色porny| 天天干天天干天天操| 欧美日韩一区二区区| 99热这里只有精品7| 青青草偷拍视频| 日韩一级片免费看| 欧美日韩视频免费在线观看| 一级日本黄色片| 无码精品人妻一区二区三区影院 | 九九久久九九久久| 日本一级淫片免费放| 一区二区在线免费观看视频| 一二三四中文字幕| 久久久久女人精品毛片九一| 99免费观看视频| 日韩av一二三四区| 在线免费av片| 亚洲欧美卡通动漫| 香蕉视频色在线观看| 天天摸天天碰天天爽天天弄| 懂色av粉嫩av蜜臀av| 日韩欧美激情视频| 亚洲狠狠婷婷综合久久久久图片| 天天摸天天碰天天添| 国产精品欧美激情在线| 午夜激情福利电影| 国产精品成人aaaa在线| 亚洲免费观看在线| 国产欧美高清在线| 亚洲AV无码精品自拍| 欧美xxxx吸乳| 特级西西444www高清大视频| 国产福利在线导航| 精品小视频在线观看| 制服丝袜在线第一页| 玩弄japan白嫩少妇hd| 午夜精品久久久久久久96蜜桃| 天天综合五月天| 亚洲中文一区二区| 乱老熟女一区二区三区| 日本少妇激情视频| 中文字幕在线观看免费高清| 思思久久精品视频| 日本泡妞xxxx免费视频软件| 国产性xxxx18免费观看视频| 国产按摩一区二区三区| 超碰人人爱人人| 97caocao| 欧美人成在线观看| 国产婷婷在线视频| 人体内射精一区二区三区| 91精品中文字幕| 免费一级淫片aaa片毛片a级|