______ Chemistry is a branch of Chemistry.


  1. A.
    Applying
  2. B.
    Apply
  3. C.
    Applied
  4. D.
    Applicant
C
此題考查apply的用法。applied通常作定語,應(yīng)用的,實用的。句意:應(yīng)用化學(xué)是化學(xué)的一個分支。
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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 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, recently the size and thickness of a penny, intended to power various micro/nano-electromechanical systems (M/NEWS). 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(dǎo)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 (晶格結(jié)構(gòu)) 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 the 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 indicate nuclear batteries can be safely used

C. to describe a nuclear-powered system            

D. to introduce various energy sources.

Liquid semiconductor is used to ________ .

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D. reduce the damage to lattice structure

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A. uses a solid semiconductor                        B. will soon replace the present ones

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科目:高中英語 來源:2015屆云南楚雄州武定縣第一中學(xué)高一下期期中考試英語卷(解析版) 題型:閱讀理解

Science, as we think, was born when the Greek philosopher ( 希臘哲學(xué)家 ) Thales ( about 640-546 B.C.) asked a difficult question: What makes up our universe?

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Boys and girls, welcome to Elite Secondary School! I’m Mr. Green, in charge of this school. I’d like to introduce you to various aspect of our school, from our history to our buildings and activities. Elite Secondary School set up in 1960. In the past fifty years, Elite had experienced a lot of changes and developments. Our school finally decided to move to Aberdeen in 1990, due to the lack of the space. The school campus now was almost three times larger than the previous one. We even have three libraries which are available with all the teachers and students. As for laboratories, they have two Physics labs, two Chemistry labs, and a Biology lab which was established last year. Students here always have an enjoyable time at school because there is a widely range of extra-curricular activities for them to choose. We try to provide as much activities for our students as possible. Elite Secondary School is committed to providing the highest level of education to the children. Thank you for your time.

 

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科目:高中英語 來源:2011-2012學(xué)年浙江省高三第一學(xué)期第一次統(tǒng)練英語試題 題型:完型填空

I lived in Dallas, Texas nearly all my life with my mom, dad and older sister. We were           41    to respect others, value education, and get all that we could out of life. My parents always say, “   42  hard and the world is yours.” They are never without a   43  word of advice or a bit of encouragement when life gets tough.

My parents always   44   me to go to college. However, when I    45  at 16 years old that I’d rather get married to a man than go to college, they    46   stopped telling me they loved me and I could anything I wanted to.   47  , they persuaded me. I graduated from high school and currently   48  the University of Oklahoma studying medicine. I want to make the   49  a better place to live in.

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A.never

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A.Carefully

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A.fortune

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10.

A.grade

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12.

A.fond

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13.

A.satisfied

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14.

A.lessons

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15.

A.teachers

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18.

A.pay

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D.show

 

19.

A.romantic

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C.constant

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A.fight

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