日本成人片在线_久久免费精品视频_国产午夜精品久久久久久免费视_校花撩起jk露出白色内裤国产精品_av影片免费在线观看_国产小视频在线看_最新av免费在线观看_99久久99久久精品国产片_欧美成人猛片aaaaaaa_蜜桃免费网站一区二区三区


Not long ago , Richard Denniston found himself suffering the same pain that millions of other pet owners have faced . His little Scottish dog had a brain tumor(腫塊)and would soon die. Like others who faced the problem before him , Denniston just wanted to end his pet’s suffering . However , he took one step further.
Deniston , an expert who studies animals , collected a tiny skin sample from the dog and took it to his laboratory at Louisiana State University. There he  cultivated  it and froze it in liquid nitrogen.
From that idea , Denniston started a new technology .Denniston’s company will save pet’s DNA $500,plus a monthly storage fee of Us $10, until cloning becomes a reality .
Thanks mostly to the contribution of a California multimillionaire , that day may not be so far off.
“It could happen extremely soon if everything went on well.”says Mark Westhusin , a professor leading a dog cloning team . Most experts put successful dog cloning a year to five years down the road . The cost is bound to be expensive at first , but it would eventually drop to a few thousand dollars.
Since Dolly , the sheep which was first cloned in 1997 ,cattle ,goats ,mice and monkeys have been cloned in labs . Pets are likely to be next.
“I really believe that the technology is going to become available for many species in the near future ,”Denniston says .
1. After his pet died ,Richard Denniston_______.
A. did something more than the ordinary pet owners
B. did as other pet owners
C. did nothing but feel very sad
D.could not help feeling lonely without his dear pet
2. Richard Denniston_________in liquid nitrogen for an experiment.
A. was a doctor who put his dog
B. was an animal expert who put a piece of his dog’s skin
C.was an expert at collecting skin samples who then put them
D.took great interest in freezing things
3. The underlined word “cultivated ”in Para . 2 probably means_________.
A. bought     B.discovered    C.caught     D.trained
4. Cloning will cost people_______.
A. a lot of money in five years .
B. much in the beginning and then be reduced to a thousand dollars.
C. much and then will surely be reduced to thousands of dollars.
D.much at first and then might be reduced to a few thousand dollars.


【小題1】A
【小題2】B
【小題3】D
【小題4】D

解析

練習(xí)冊系列答案
相關(guān)習(xí)題

科目:高中英語 來源: 題型:單選題

If you are able to talk to a friend over the telephone, you feel that you are close _____ the actual distance is not shortened.


  1. A.
    even if
  2. B.
    so long as
  3. C.
    if
  4. D.
    as

查看答案和解析>>

科目:高中英語 來源:2012-2013學(xué)年湖南長沙縣實驗中學(xué)高三高考模擬(一)英語卷(解析版) 題型:其他題

Not long ago, many people believed that babies only wanted food and to be kept warm and dry. Some people thought babies were not able to learn things until they were five or six months old. But doctors in the United States now say babies begin learning on their first day of life.

A baby learns to get the best care possible by smiling to please her mother or other caregiver. This is how babies learn to connect and communicate with other people.

The researchers say this ability to learn exists in a baby even before birth. They say newborn babies can recognize and understand sounds they heard while they were still developing inside their mothers.

Experts say the first three years of a child’s life are the most intensive period of language and speech development. This is the time when the brain is developing. Language and communication skills are believed to develop best in an environment that is rich with sounds and sights. Experts say babies should repeatedly hear the speech and language of other people.

America’s National Institutes of Health says evidence suggests there are important periods of speech and language development in children. The ability to learn a language will be more difficult if these periods pass without early contact with a language.

The first signs of communication happen during the first few days of life, when a baby learns that crying will bring food and attention. Research shows that most children recognize the general sounds of their native language by six months of age. By that time, a baby usually begins to make sounds. These sounds become a kind of nonsense speech over time.

1.When does the author think babies begin to learn? (no more than 9 words, 2 marks)

                                                                                                                                    

2.Why do babies smile to please her mother or other caregiver? (no more than 9 words, 2 marks)

                                                                                                                                    

3.According to experts, how can babies’ language and communication skills develop? (no more than 8 words, 3 marks)

                                                                                                                                    

4.What does the author mainly tell us? (no more than 8 words, 3 marks)

                                                                                                                                    

 

查看答案和解析>>

科目:高中英語 來源:2014屆江西省南昌市高二下學(xué)期期中考試英語試卷(解析版) 題型:閱讀理解

When Boris left school,he could not find a job.He tried hard and pestered(糾纏)his relatives,but they had problems of their Own. He answered advertisements until he could not afford to buy any more stamps. Boris grew annoyed,then depressed,then a little hardened.Still he went on trying and still he failed.He began to think that he had no future at all.

“Why don’t you start your own business?” one of his uncles told him.“The world is a  money-locker. You’d better find a way of opening it.”

“But what can I do?”

“Get out and have a look round,” advised his uncle in a vague sort of way.“See what people want;then give it to them,and they will pay for it.”

Boris began to cycle around the town and found a suitable piece of a waste ground in the end. Then he set up his business as a cycle repairer.He worked hard,made friends with his customers and gradually managed to build up his goodwill and profit.A few months later, he found that he had more work than he could deal with by himself.He found a number of empty shops but they were all no good:in the wrong position,too expensive or with some other snag(障礙). But at long last,he managed to find an empty shop on a new estate where there were plenty of customers but no competition.

Boris and his assistant taught themselves how to repair scooters and motor-cycles.Slowly  but surely the profits increased and the business developed. At last,Boris had managed to open the money-locker and found bank notes and gold Coins inside.

1.Which of the following would be the best title for the passage ?

A.Goodwill is the key to success.

B.The world is a money-locker

C.No education, no future

D.Difficulty of starting a small business

2.Which of the following best describes Boris’ job hunting experience?

A.Surprising         B.Encouraging        C.Boring            D.Disappointing

3.Boris start his career by       . 

A.cycling around the town

B.developing a waste ground

C.repairing cycles

D.buying empty shops

4.Boris finally chose an empty shop on a new estate because      .

A.it was not so expensive

B.he had a lot of old customers there

C.he could make good use of his skills there

D.there were good opportunities there

5.We can infer from the last paragraph that Boris       .

A.still couldn’t make good profits

B.set off in a successful career

C.found a lot of gold coins by accident

D.had great difficulty running his business

 

查看答案和解析>>

科目:高中英語 來源:2014屆廣東省東莞市高二3月月考英語試卷(解析版) 題型:閱讀理解

Most people around the world are right-handed. This also seems to be true in history. In 1799, scientists studied works of art made at different times from 1,500 B.C. to the 1950s. Most of the people shown in these works are right-handed, so the scientists guessed that right-handedness has always been common through history. Today, only about 10% to 15% of the world’s population is left-handed.

Why are there more right-handed people than left-handed ones? Scientists now know that a person’s two hands each have their own jobs. For most people, the hand is used to find things or hold things. The right hand is used to work with things. This is because of the different work of the two sides of the brain. The right side of the brain, which makes a person’s hands and eyes work together, controls the left hand. The left-side of the brain, which controls the right hand, is the centre for thinking and doing problems. These findings show that more artists should be left-handed, and studies have found that left-handedness is twice as common among artists as among people in other jobs.

No one really knows what makes a person become right-handed instead of left-handed. Scientists have found that almost 40% of the people become left-handed because their main brain is damaged when they are born. However, this doesn’t happen to everyone, so scientists guess there must be another reason why people become left-handed. One idea is that people usually get right-handed from their parents. If a person does not receive the gene(基因) for right-handedness, he / she may become either right-handed or left-handed according to the chance and the people they work or live with.

Though right-handedness is more common than left-handedness, people no longer think left-handed people are strange or unusual. A long time ago, left-handed children were made to use their right hands like other children, but today they don’t have to.

1.After studying works of art made at different times in history, the scientists found _______.

A. the art began from 1,500 B.C.

B. the works of art ended in the 1950s

C. most people shown in the works of art are right-handed

D. most people shown in the works of art are left-handed

2.How many people in the world are left-handed now?

A.Less than one sixth.                      B.More than a half.

C.About 40%.                            D.The passage doesn’t tell us.

3.What is the hand for most people used to do?

A.It’s used to find or hold things.

B.It’s used to work with things.

C.It’s used to make a person’s eyes work together.

D.It’s the centre for thinking and doing problems.

4.According to the passage, which of the following is NOT true?

A.No one really knows what makes a person become right-handed.

B.Left-handedness is cleverer than right-handedness.

C.Today children are not made to use their right hands only.

D.Scientists think there must be some reason why people become left-handed.

5.The best title for this passage is _______.

A.Scientists’ New Inventions               B.Left-handed People

C.Which Hand                           D.Different Brains, Different Hands

 

查看答案和解析>>

科目:高中英語 來源:同步題 題型:單選題

He spoke at the meeting and said that three years in high school ________ not long.
[     ]
A. be  
B. are
C. is  
D. been

查看答案和解析>>

同步練習(xí)冊答案
日本熟伦人妇xxxx| 久久综合九色综合欧美狠狠| 国色天香久久精品国产一区| 999福利在线视频| 波多野结衣在线网站| 黄色小视频在线播放| 精品久久久久成人码免费动漫| 国产成人一级片| 国产成人无码精品久久久久| 日韩一卡二卡在线观看| 亚洲第一视频区| 黑人巨大精品欧美| 波多野结衣影院| 波多野结衣三级视频| www.超碰97.com| 亚洲三级视频网站| 日本xxxxxxx免费视频| 青青艹视频在线| 国产深夜男女无套内射| 亚洲爆乳无码精品aaa片蜜桃| 亚洲精品在线观看免费| 深夜福利成人| 亚洲综合av一区| 熟女视频一区二区三区| 一本一生久久a久久精品综合蜜 | 成人在线免费| 久久手机视频| y111111国产精品久久婷婷| 成人av资源在线播放| 成人黄在线观看| 亚洲自拍欧美色图| 97人人模人人爽人人喊38tv| 成人欧美一区二区三区黑人免费| 成人av播放| 麻豆视频成人| 欧美日韩在线免费观看视频| 一本色道久久88亚洲精品综合| 国内精品国产三级国产99| 六月婷婷激情网| 男人的天堂狠狠干| 已婚少妇美妙人妻系列| 久久出品必属精品| 亚洲色图14p| 亚洲欧美精品久久| 91精品国产乱码在线观看| 波多野结衣视频在线观看| 91精品中文字幕| 无码国产色欲xxxx视频| 九色在线观看视频| 日本伦理一区二区| 国产精品诱惑| 小嫩嫩12欧美| 牛夜精品久久久久久久99黑人| 亚洲麻豆视频| 国产福利91精品一区二区三区| www国产成人| 亚洲九九爱视频| 欧美在线观看18| 亚洲国产精品一区二区三区| 日韩亚洲精品电影| 日韩av免费网站| 国内精品国语自产拍在线观看| 中文字幕中文字幕在线中心一区 | 西西人体一区二区| 91精品在线免费视频| 日本成人精品| 久久综合av| 久久九九精品| 国产**成人网毛片九色| 国产精品传媒视频| 欧美在线观看一二区| 精品国产91九色蝌蚪| 久久亚洲电影天堂| 成人激情在线播放| 亚洲精品tv久久久久久久久| 日韩少妇内射免费播放| 日韩无码精品一区二区| 免费无码毛片一区二区app| 欧美视频xxxx| 日本福利片在线| 美女18一级毛片一品久道久久综合| 日韩欧美一级| 亚洲性图久久| 91免费看视频| 91成人在线免费观看| 亚洲天堂av综合网| 国产精品毛片a∨一区二区三区|国| 久久精品aaaaaa毛片| 97久久综合区小说区图片区| 亚洲国产精品免费视频| 欧美.日韩.国产.一区.二区| 国内精品在线播放| 国产精品久久久久久久久动漫 | 欧美日韩一区二区三区高清| 国产一区二区三区四区福利| 亚洲最大的黄色网址| 岛国精品资源网站| 国产无套粉嫩白浆内谢| 欧美18一12sex性处hd| 波多一区二区| 国产成人精品免费视| 日欧美一区二区| 亚洲品质自拍视频| 亚洲精品成人久久电影| 日韩av理论片| 久久久成人精品一区二区三区| 激情文学亚洲色图| 日韩伦人妻无码| 日本高清久久一区二区三区| 国产精品成人久久电影| 精品无人区无码乱码毛片国产| 91黑人精品一区二区三区| 国产亚洲依依| 国产无遮挡裸体免费久久| 久久精品动漫| 亚洲综合一区二区精品导航| 亚洲男人的天堂在线| 亚洲www在线| 日韩在线xxx| 欧美日韩精品一区二区三区视频播放 | 在线免费观看一区| 韩国精品久久久999| 亚洲激情一区二区| 国产成人av一区二区三区不卡| 国产女人高潮毛片| 日韩在线伦理| 国产一区亚洲| **网站欧美大片在线观看| 亚洲精品在线不卡| 国产精品国产三级欧美二区| 激情视频免费网站| 男人天堂视频网| 在线不卡日本v二区707| 成人羞羞在线观看网站| 久久久久国产免费免费| 亚洲美女免费精品视频在线观看| 91免费精品视频| 国产性生活一级片| 亚洲熟妇av乱码在线观看| 蜜臀av在线| 欧美三级视频| 一区二区三区美女| 久久天天躁狠狠躁夜夜躁| 日本精品一区二区| 干b视频在线观看| 一个人免费观看视频www在线播放| 免费一级欧美片在线观看网站| 精品中文字幕一区二区| 欧美无砖砖区免费| 91精品国产综合久久男男| 精品久久久久久中文字幕2017| 精品久久久久久久久久久久久久久久| www国产在线观看| 欧美人成在线| 黄色一区二区在线观看| 9.1国产丝袜在线观看 | www日本在线观看| 成人午夜精品福利免费| 成人污污www网站免费丝瓜| 精品影视av免费| 欧美变态凌虐bdsm| 久久久水蜜桃| 欧美日韩国产一二三区| 1区2区3区在线观看| 希岛爱理一区二区三区| 亚洲高清一区二区三区| 日韩av电影在线网| 亚洲精品综合在线观看| 丰满大乳国产精品| 亚洲欧美成人vr| 自拍偷拍国产亚洲| 97在线免费视频| 国产日韩欧美久久| 成人毛片在线精品国产| 狠狠久久伊人| 成人欧美一区二区三区白人| 性欧美激情精品| 五月婷婷之婷婷| 日批免费在线观看| 国产成人ay| 一区二区三区不卡在线观看| 欧洲亚洲在线视频| 深夜福利网站在线观看| 在线免费观看黄色片| 99国产精品一区二区| 日韩欧美亚洲综合| www.久久草| 亚洲视频重口味| free性欧美| 国产乱国产乱300精品| 亚洲人成电影在线观看天堂色| 美国av在线播放| 精品乱码一区内射人妻无码 | 久久青青草原一区二区| 无码人妻aⅴ一区二区三区69岛| a黄色在线观看| 亚洲高清不卡| 日韩精品一区二区三区视频播放 | 欧美成人精品在线| 中文字幕av专区| 黄页网站视频在线观看| 欧美成人嫩草网站| 欧美一区二区三区视频| 亚洲免费在线精品一区| 久久久久99精品成人片三人毛片| 日韩毛片免费看| 国产欧美日韩在线| 欧美洲成人男女午夜视频| 国产 xxxx| av免费网站在线| 国产一本一道久久香蕉| 久久亚洲精品小早川怜子66| 91激情视频在线| 色视频在线观看| 欧美一级久久| 亚洲人成电影在线| 欧美在线观看视频网站| 同心难改在线观看| 久久精品一区二区三区中文字幕 | 欧美黑人xxxx| aaaa黄色片| 丁香花视频在线观看| 东方欧美亚洲色图在线| 欧美激情伊人电影| 国产精品九九九九九| 国精一区二区三区| 久久一二三国产| 国产精品高清免费在线观看| 亚洲黄色网址大全| 成人mm视频在线观看| 97超视频在线观看| 亚洲av无码片一区二区三区| 国产午夜一区| 在线91免费看| www.亚洲视频.com| 最新av在线| 免费成人你懂的| 欧美另类精品xxxx孕妇| www国产视频| 91制片厂免费观看| 性生交生活影碟片| 一区二区亚洲| 中文日韩电影网站| 久久在线91| 国产激情偷乱视频一区二区三区| 在线亚洲午夜片av大片| 亚洲视频在线播放| 天天色综合天天色| 二区在线播放| 91麻豆蜜桃一区二区三区| 国产欧美在线看| 看片网址国产福利av中文字幕| 要久久爱电视剧全集完整观看| 欧美色视频一区| 我的公把我弄高潮了视频| 日本ー区在线视频| 成人午夜伦理影院| 91亚洲永久免费精品| 国产午夜麻豆影院在线观看| 日韩专区精品| 伊人久久精品视频| 91玉足脚交白嫩脚丫| 欧美成人福利| 色噜噜狠狠一区二区三区果冻| www.好吊操| 最新97超碰在线| 国产日韩av一区| 久久另类ts人妖一区二区| 亚洲精品久久久久久久久久 | 亚洲天堂网站在线观看视频| 色婷婷精品久久二区二区密| 欧美美女被草| 欧美日本一区二区三区四区| 国产a级一级片| 欧美精品videossex少妇| 亚洲视频在线一区观看| 中文字幕一区二区三区四区五区六区| а√最新版地址在线天堂| 国产成a人亚洲精| 99国产高清| 亚洲国产成人一区二区| 美女脱光内衣内裤视频久久影院| 国产成人久久精品| 中文字幕av第一页| 可以看av的网站久久看| 国产成人黄色av| 欧美激情一区二区三区免费观看| 在线亚洲观看| 国产mv免费观看入口亚洲| 亚洲天堂五月天| 久久精品导航| 国产一区二区色| 国产人妖一区二区三区| 国精产品一区一区三区mba桃花| 成人激情黄色网| 欧美熟妇交换久久久久久分类 | 美女福利视频在线| www.日韩| 91精品国产综合久久精品性色 | 亚洲女同二女同志奶水| 欧美日韩伦理| 欧美情侣性视频| 国产专区第一页| 丝袜美腿亚洲一区| 91麻豆国产精品| 亚洲AV成人无码一二三区在线| 99久久精品一区| 亚洲精品二区| 国产精品刘玥久久一区| 五月激情综合色| 一区二区xxx| 亚洲一区二区三区免费| 亚洲免费精彩视频| 加勒比av在线播放| 欧美一区=区| 成人免费视频网站| 欧美婷婷久久五月精品三区| 国产日韩欧美精品一区| 91亚洲精品国产| 日本不卡一二三| 亚洲精品一区二区三区蜜桃下载| 亚洲人成人无码网www国产 | 日韩性生活视频| 男女视频免费看| 美国十次了思思久久精品导航| 国产嫩草一区二区三区在线观看| 日本精品专区| 亚洲大片在线观看| 无码人妻丰满熟妇区毛片蜜桃精品| 麻豆一区二区麻豆免费观看| 欧美老女人xx| 国产三级午夜理伦三级| 99r精品视频| 国产精品专区在线| 91麻豆精品| 久久精品国产91精品亚洲| 国产日韩在线免费观看| 粉嫩蜜臀av国产精品网站| 欧美日韩一区二区三区电影| 久久久久久久| 亚洲女成人图区| 亚洲欧美综合另类| 成人国产精品免费| 欧美日韩一道本| 亚洲日本va午夜在线电影| 久热国产精品视频| www.好吊色| 精品国产123| 成人一级生活片| 色婷婷综合久久久中字幕精品久久| 欧美岛国在线观看| 欧美日韩在线观看免费| 日韩中文字幕在线视频播放| 国产精品三级在线观看无码| 综合激情婷婷| 亚洲一区国产精品| 成年人在线观看视频| 在线观看视频91| 91禁男男在线观看| 美女尤物国产一区| 国产精品免费观看视频| 久久综合九色综合88i| 日本精品在线观看| 午夜精品久久久久久久白皮肤| 中出福利视频| 色婷婷av一区| 黄色录像免费观看| 久久国产乱子精品免费女| 神马午夜伦理影院| 中文一区二区三区四区| 日本精品va在线观看| 国产青青草在线| 日韩三级视频在线观看| 成人免费看视频网站| 日韩精品免费在线| 国产情侣小视频| 欧美国产一区视频在线观看| www.偷拍.com| 韩日欧美一区| 日韩中文一区| 精品国产乱码久久久久久樱花| 91sao在线观看国产| 成人综合影院| 亚洲第一区在线| 国产女人18毛片水真多| 亚洲一区电影777| 成人18视频免费69| 成人免费高清在线| 狠狠躁狠狠躁视频专区| 亚洲最大黄网| 亚洲精品国产系列| 91成人精品在线| 亚洲已满18点击进入在线看片| h片在线观看| 青青草国产成人a∨下载安卓| 国产乱码精品一区二区三区中文| 小草在线视频免费播放| 欧美成人免费一级人片100| 欧美大片aaa| 日韩激情av在线免费观看|