Scientists have determined it's not advisable to hurry marriage. But what’s the best age to wed? When Avril Lavigne announced she was splitting from her husband, comments from her friends suggested t 题目和参考答案——青夏教育精英家教网—

题目内容

Scientists have determined it's not advisable to hurry marriage. But what’s the best age to wed?

When Avril Lavigne announced she was splitting from her husband, comments from her friends suggested that she was only 21 when she tied the knot and later she said that she realized she'd been too young to make such a life-altering decision. Could fellow young celebrity divorcées(离婚者) Reese Witherspoon, Kate Hudson, and Britney Spears have also hit the same age-related issue?

The Magic Number

There are practical reasons for the mid-20s dividing line, and most of them boil down to two biggies: education and money.

It turns out that the more years of higher education a woman has under her belt on her wedding day, the lower the chances that she'll get divorced ... and by 25, you're more likely to have earned a degree or two. Educated women tend to be more confident about who they are and less willing to settle for a man who doesn't meet their standards.

Odds(可能性) are that by 25 you're also supporting yourself, so there's less incentive（刺激; 鼓励）for you to rush into marriage because you're seeking financial security from him. But the marriage-related benefits of working and having money of your own go beyond feeling secure. Learning to budget your cash carefully when you're single will help you avoid financial problems—one of the main causes of couple fights—for the rest of your life.

Knowing the Real You

At 25, you've had time for some crucial life experiences, including a relationship or two that may have improved your Mr. Right radar. You've probably dated enough to have a better idea of what you don't want in a man, which makes it easier to know what you can live with and can't live without.

Perhaps the most important aspect of waiting is that you'll know what your goals and values really are. While you don't want to marry someone just like you, marriage is a lot easier if you two share a similar outlook on life.

Twenty-four and already married to the man of your dreams? Don't worry: Many young marriages survive. But given the choice, you might consider putting off the big day until your mid-20s or later.

1. What main factors influence the mid-20s dividing line? (No more than 3 words)

_________________________________________________________________

2.According to the author, why does a couple probably fight？(No more than 4 words)

_________________________________________________________________

3.How do you know what you don’t want in a man? (No more than 5 words)

________________________________________________________________

4.What suggestion does the passage mainly give? (No more than 10 words)

_________________________________________________________________

【答案】

1.Money and education.

2.Because of financial problems.

3.By dating enough/ You’ve probably dated enough /Through some crucial life experience.

4.It’s not advisable to get married before 25 years old / You better wed until mid-20s./Put off marriage until your mid-20s or later.

【解析】略

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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(半导体). 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(晶体结构) 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%)

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

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

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(等级的) 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.

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（调查）,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（实证）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（正确性）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（计算）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?