He seldom stay up late at night, ________ necessary, to keep himself full of energy the next day.

   A. if       B. unless       C. until       D. while

練習(xí)冊系列答案
相關(guān)習(xí)題

科目：高中英語 來源： 題型：閱讀理解

Qian Xuesen is one of the pioneers of China's space science. As a world-famous expert on aerospace rockets and aerodynamics, he obtained great achievements in the areas of applied mechanics, engineering cybernetics and system engineering and made distinguished contributions to the foundation and development of Chinese aerospace undertaking(事業(yè)).

    He graduated from Shanghai Jiaotong University in 1934, and Qian Xuesen went to the United States to study in MIT, Massachusetts Institute of Technology, one year later. After receiving master's degree in MIT, he went to study in California Institute of Technology and received PhD degrees in both aerospace and mathematics.

    In 1955, six years after the founding of People's Republic of China, Qian Xuesen returned to his motherland. His return brought China the hope of developing space science and its own missiles. In 1956, Qian Xuesen put forward “Proposal on the Development of China's Aviation Industry for National Defense”. With the support from Zhou Enlai, the premier, and marshal Nie Rongzheng, Qian Xuesen began to prepare for the establishment of China's first missile and rocket research and development structure, the Fifth Research Institute of State Ministry of Defense. Henceforth(從此以后), he has long been in charge of the chief technological research and development of China's missile, rocket and spacecraft.

    Due to research and development led by Qian Xuesen, China successfully exploded its first atom bomb in 1964. Later, China launched its first man-made satellite, Dong Fang Hong I, to the earth orbit on April 24, 1970, becoming the fifth country in the world to independently launch satellite following the former Union of Soviet Socialist Republics, the USA, France and Japan. The satellite floated around the earth, blaring(高聲播放)the song Dong Fang Hong, which has the same name as the satellite.

    As a forerunner leading the development of China's aerospace science and technology, Qian Xuesen also provided chances for young scientists. Wang Yongzhi, former chief designer of China's manned-space project, has benefited a lot from Qian Xuesen. “He suggested that rocket of the second generation should be developed by our second generation scientists. This suggestion gave us chances to be general designers.” Recalling the experience working with Qian Xuesen, Sun Jiadong, general designer of China's lunar orbiter project, is very grateful. “He put great expectation on us and trusted us a lot. Whenever we made mistakes, he seldom blamed us, but helped us to find out the reason so we could avoid it in the future.”

    Honored as Father of China's Missile and King of Rockets, Qian Xuesen never stopped his work on scientific research after he retired. He said he had no time to review the past, but looked forward to the future.

When did Qian xuesen begin to study in Massachusetts Institute of Technology?

A. In 1955.     B. In 1935.    C. In 1936.     D. In 1934.

Which of the following is about the five countries that launched man-made satellite independently before 1970?

A. The former Union of Soviet Socialist Republics, the UK, France, China and Japan.

B. The former Union of Soviet Socialist Republics, the USA, Japan, Canada and China.

C. America, France, Japan, China and Australia.

D. The former Union of Soviet Socialist Republics, America, France, Japan and China.

What does the underlined word “forerunner”(Paragraph 5) probably mean?                                 

A. A leader.

C. A competitor.    B. A pioneer.

D. A successful scientist.

According to the passage, which of the following about Qian Xuesen is NOT true?

A. In 1956, he made good preparations for the Fifth Research Institute of State Ministry of Defence.

B. He made outstanding contributions to the establishment and development of Chinese aerospace

undertaking.

C. He returned to China, bringing China the hope of developing space science and its own missiles.

D. He devoted all his life to China’s space science.

It can be inferred from Paragraph 5 that _________.

A. Qian Xuesen is very concerned about the development of young scientists

B. The help of Qian Xuesen is beneficial to young scientists

C. Qian Xuesen gives many opportunities to general designers

D. When the chief designers do something wrong, Qian Xuesen helps them find out the cause

查看答案和解析>>

科目：高中英語 來源： 題型：

---- He seldom goes abroad, does he?

---- ________. Only once when he was young.

A. Yes, he doesn’t    B. Yes, he does   C. No, he doesn’t      D. No, he does

查看答案和解析>>

科目：高中英語 來源：2013屆安徽省馬鞍山市高三第一次教學(xué)質(zhì)量檢測英語試卷（帶解析） 題型：單選題

— Does your father like going to movies?
— Not really. He seldom, _______, visits the cinema.

A．in additionB．when necessaryC．if everD．a(chǎn)bove all

查看答案和解析>>

科目：高中英語 來源：2011-2012學(xué)年云南省景洪市第一中學(xué)高一上學(xué)期期末考試英語試卷（帶解析） 題型：閱讀理解

A German who has been a volunteer teacher in the Guangxi countryside for ten years is a celebrity ( 名人)in China these days .
42-year-old Echart Lowwe was born in Hamburg , Germany . He graduated form the Hamburg Academy of Fine Arts. In the early 1990, Echart Lowwe traveled to China and became greatly interested in the country . In 1999 , he started working as a high school teacher in the city of Hechi , Guangxi , Later he went to a primary school in the remote Banlie Village to work as a volunteer teacher . He is still teaching there now .
His teaching methods are different from Chinese teachers . He never uses textbooks in class or sets exams .He seldom tells students how to do things , but instead encourages his pupils to be independent . He teaches music , nature and painting . To teach his students the spirit of teamwork , he asked them to paint a picture together .
Lowwe loves being with children . Kids love him back . He is often seen surrounded by groups of kids. “I feel he is our loved one .He is close to us ,”one of his students says.
Lowwe said “ I have always had the desire to teach in the countryside. I am doing what I want to do now . If I had to die right now , I would die happily ,” he said .
根據(jù)短文內(nèi)容，判斷以下句子的（ T ）誤（ F ）。
【小題1】Echart Lowwe is a volunteer teacher from Germany .
【小題2】He used to work as a painter in Hechi .
【小題3】He has his own ways of teaching .
【小題4】Kids love him because he helps them do exams better .
【小題5】Echart Lowwe doesn’t regret what he is doing .

查看答案和解析>>

科目：高中英語 來源：內(nèi)蒙古赤峰市2010年高三年級統(tǒng)一考試（英語） 題型：閱讀理解

第三部分：閱讀理解（共20小題，每題2分，滿分40分）

閱讀下列短文，從每題所給的四個選項（A、B、C和D）中，選出最佳選項。

Sam, an unemployed piano tuner, said it was only the second thing he had ever won in his life．The first thing was an Afghan blanket at a church raffle（抽獎） when he was 25 years old．But this was much bigger: it was $120,000! He had won the Big Cube, a state lottery(彩票) game．To win, a contestant must first guess which number a spinning cube will stop on．The cube has six numbers on it: 1X, 10X, 50X, 100X, 500X, and 1000X．If he is correct, the contestant must then guess which of two selected variables（變量） is going to be greater．So, just guessing which number appears on the cube does not guarantee that you will win any money．

Sam correctly guessed 1000X, but he still had to choose between two variables．One variable was the number of cars that would run the stop sign at Hill Street and Lake Avenue in six hours．The other variable was the number of times that a teenage boy would change TV channels in a three-hour period．This was a tough decision．

Finally, Sam flipped a coin．It came up heads, so Sam picked the teenager．He picked right．The stop sign was run only 76 times, but the teen clicked 120 times．Sixty-year-old Sam jumped for joy, for he had just won 1000 times 120, or $120,000．Sam dreamily left the lottery studio．Talking excitedly on his cell phone while crossing the street, he got hit by a little sports car．

Sam is slowly getting better．He was in the hospital for a month．His hospital bill was $110,000．And the insurance company for the little sports car’s owner sued（起訴）Sam for $9,000 worth of repairs．Also, Sam still has to pay federal taxes on his winnings．Sam doesn’t play the state lottery any more．He says it’s better to be unlucky．

56．What can be inferred about Sam from the passage?

A．He always has bad luck.            B．He seldom goes to a raffle.

C．He is a very careful person in life.    D．He used to be crazy about lottery tickets.

57．Which of the following played a vital role in Sam’s winning the big prize?

A．The cube. B．The coin.  C．The blanket.     D．The stop sign.

58．Which of the following is TRUE according to the passage?

A．The lottery game was a complete lie.

B．Sam was quite familiar with the boy.

C．The owner of the car is now in hospital.

D．Sam will have none of the prize money left.

59．What could be the best title for the passage?

A．Curiosity killed the cat      B．Joy puts heart into a man

C．Extreme joy ends in sorrow    D．A bird in hand is worth two in the bush

 

查看答案和解析>>

同步練習(xí)冊答案