题目内容

   1.   Scientists and experts have proved the uniqueness of finger-prints and discovered that no exactly similar pattern is passed on from parents to children, though nobody knows why this is the case.

The ridge (隆起) structure on a person's fingers does not change with growth and is not affected by surface injuries. Burns, cuts and other damage to the outer part of the skin will be replaced in time by new one, which bears a reproduction of the original pattern.    2.    Some criminals make use of this fact to remove their own finger-prints but this is a dangerous and rare step to take.

Finger-prints can be made very easily with printer's ink. They can be recorded easily.   3.   Because of the simplicity and economy of this system, finger-prints have often been used as a method of solving criminal case. A suspected man may deny a charge but this may be in vain.   4.   . When a suspect leaves finger-prints behind at the scene of a crime, they are difficult to detect with the naked eye.    5.   Some of the marks found are incomplete but identification is possible if a print of a quarter of an inch square can be obtained.

A. Special techniques are used to "develop" them.

B. A fingerprint is an impression of the friction ridges of all part of the finger.

C. It is only when the inner skin is injured that the arrangement will be destroyed.

D. With special methods, identification can be achieved successfully within a short time.

E. A latent(潜在的) print is the chance that reproduction of the friction(摩擦) ridges deposited(存放) on the surface of an item.

F. His finger-prints can prove who he is even if his appearance has been changed by age or accident.

G. Every human being has a unique arrangement of the skin on his fingers and this arrangement is unchangeable.

 

【答案】

 

1.G

2.C

3.D

4.F

5.A

【解析】

试题分析:本文讲述了指纹的唯一性和它在刑事案件侦破中的重要作用。

1.推断题。第一段第二句句意为科学家们和专家们都证明了指纹的独特性, 并且还发现父母没有遗传给小孩相同相似的纹路排列,然而没人知道这是为什么,可知前一句应提到了指纹的唯一性,只有G句每一个人在其手指上都有着独一无二的纹路排列,而且这种排列是不会改变的,提到了这一特性,故选G。

2.细节题。第二段第二句说“烫伤,割伤和其它的表皮损害都会被新皮肤给取代,而且还会长出原有的纹路来”,第四句说“一些罪犯利用这点而去销毁他们的指纹,但是走这一步是危险和罕见的”,可知如消除指纹特征,表层皮肤(the outer part of the skin)受损不会改变特征,那么只有深层皮肤( the inner skin)受损可改变了,故选C。

3.推断题。第三段第四句句意为由于这种系统的简单和经济,指纹鉴定已经经常被用作解决刑事案件一种方法,可知指纹的唯一性可指证身份,D项“使用特殊的方法,身份确认可以在很短时间内成功的达成”,故选D。

4.推断题。第三段第五句意为“嫌疑犯可以否认对他的指控但是这也许是在徒劳”,

可知由于指纹唯一性,即使年龄、面貌或其他特征改变,指纹也不会变,F项“即使他的外表或许因为年龄或者事故而改变,但是他的指纹能证明他是谁”,故选F。

5.推断题。第三段第七句意为“当一个嫌疑犯在犯罪现场留下指纹印的时候,是很难用肉眼察觉的”,A项“特殊的技术被用于使之现形”,故选A。

考点:信息匹配。

 

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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%)

    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?

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.?

 

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