题目内容

Calculations, which are astronomically exact, have been made     with the use of computers.

A. possible B. it possible  C. possibly D. to be possible

A

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China’s Tianhe-1 has a computing speed of 2,507 trillion（万亿）calculations a second, making it the fastest computer in the world. It is also 40 percent faster than the world’s second fastest supercomputer, Cray XT5 Jaguar, in the US, kept at a national laboratory in Tennessee, according to the New York Times. Jack Dongarra, a University of Tennessee computer scientist, told NYT that the Chinese supercomputer is faster than the existing Number One machine.
Building the fastest supercomputer has become a source of national pride, as these machines are valued for their ability to solve problems in areas like defense, energy and science. These problems are related to national interests. Supercomputing technology is also found in business. Oil and gas companies use supercomputers to find oil and gas.
Obviously, research centers with large supercomputers attract top scientific talents. This adds extra importance to the machines—they’re more than just huge computers.
China’s new supercomputer will be used to speed up greatly scientific calculations, such as hurricane and tsunami modeling, cancer research, car design and even studying stars.
In 2008, two US scientists put together a step-by-step guide on how to build a supercomputer using PlayStation 3 video-game consoles（控制台）. Modern supercomputers are built by combining thousands of small computer servers（服务器）and using software to turn them into one large computer. Really, any organization with enough material and technology can create a fast machine.
The Chinese system follows that model by linking thousands upon thousands of computer servers. But the secret behind the system—and the technological achievement—is China’s own networking technology. “That technology was built by them,” Dongarra said. “They are taking supercomputing very seriously and using a lot of time and money.”
“China is still a developing country,” said Sha Chaoqun, manager at Dawning Company which is the leading supercomputer maker in China. “Maybe one day, China’s total computing power can be greater than that of the US, but there is still a long way to go before we get there.”

Paragraph outline
Supporting details
China has developed the world’s fastest supercomputer.
◇Tianhe-1 has a high computing speed, which (1)__________ it the fastest computer in the world.
◇Tianhe-1 is 40 percent faster than the (2)__________ fastest supercomputer in the world.
◇(3)__________ Jack Dongarra, we learn that the Chinese supercomputer is faster than the existing Number One machine.
Many countries see the fastest supercomputer as a source of national (4)__________ and are making efforts to develop it.
◇The high-speed computer is (5)__________ to solve problems related to national interests.
◇Besides (6)__________, supercomputing technology can also be found in areas of defence, energy and science.
◇It’s obvious that top scientific talents are (7)__________ to research centers with large supercomputers.
The secret behind supercomputers is networking technology.
◇By using the technology built by Chinese people, taking it (8)__________ and devoting lots of time and money, China has achieved a lot.
Mr. Sha showed a conservative（保守的） (9)__________ toward the development of computing power.
◇(10)__________ the greater computing power China may have in the future, there is still a long way to go.

Taking a math test can be pretty stressful. Even if you know the material, you can still get the problem wrong. Knowing how to go through your math test and check your work can save you from handing in a test full of mistakes that can be avoided.   【小题1】 
Write it out
You can also check a math problem by writing everything out on paper.   【小题2】  Writing out math problems reduces your chances of missing anything to the lowest possible level, which is a common cause of incorrect answers.
 【小题3】 
Make sure your answers work by doing the opposite procedure of what your problem calls for, including the answer you got the first time around. In other words, you would use the opposite of this addition problem—subtraction (减法)—to determine whether or not your answer is the correct one.
Plugging in
You may find that a variable isn’t good enough or have a problem where you have to solve for a variable (变量).   【小题4】  This is the only real way to assure yourself that the answer you’ve found is correct.
Check for a reasonable answer
  【小题5】  For example, if you get an answer in the millions and you know it should be in the thousands, you’ve likely misplaced a point. Go back through the work on your paper to make sure all of your formulas (公式) and calculations are correct. If everything looks okay, do the problem again and compare the result of the second try to what you’ve got on the first try.

A．Do the opposite
B．Correct the answers
C．Therefore you’ll improve your grades, as well as your math skills.
D．Plug the variable in the equation (方程) to check it out.
E. If the result of a problem seems to make no sense, it indicates that the answer is incorrect.
F. It also helps you to figure out everything after you have already finished the test.
G. This helps you to know what information you have and what information you need to solve.

Global surface temperatures have increased 0.6—1.2 degrees since the late 19th century. The 20th century’s 10 warmest years all happened within the last 15 years. Of these,1998 was the warmest year on record. The snow covering the Northern Hemisphere（半球）and floating ice in the Arctic Ocean decreased. Globally, sea level has risen 4—10 inches over the past century. World-wide amount of rain and snow over land has increased by about one percent. The number of major rainfall events has increased throughout much of the United States.

Increasing concentrations（集中）of greenhouse gases are likely to make climate change faster. Scientists expect that the average global surface temperature could rise 1.6—6.3 degrees by 2100，and the climate in different areas could change differently. Evaporation（蒸发）will increase as the climate warms, which will increase average global amount of rain and snow. Soil moisture（潮湿）is likely to decrease in many areas, and strong rainstorms are likely to become more frequent.Sea level is likely to rise two feet along most of the U.S coast.

Calculations of climate change for certain areas are much less able to be trusted than global ones, and it is unclear whether the climate in different areas will become more variable（变化无常的）.

64．Which of the following statements is not mentioned in the first paragraph?

A．The snow has been seen covering the Southern Hemisphere .

B．More and more major rainfall events have happened to the U.S.

C．On the whole earth, sea level has risen 4—10 inches.

D．The amount of the rain in the world has increased by about 1%.

65．According to scientists, the reason why the climate becomes warm is that________.

A．the snow covering Northern Hemisphere has decreased

B．evaporation has increased in the recent years

C．greenhouse gases concentrate increasingly

D．the floating ice in the Arctic Ocean has decreased

66．It is because______ that strong rainstorms become more frequent.

A．average global little of rain and snow increases

B．the climate becomes warm

C．soil moisture decreases

D．sea level rises two feet

 

 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 is not a tool a scientist uses but how he uses these tools that makes him a scientist. You will probably agree that knowing how to use a power is important to a carpenter. You will probably agree, too, that knowing how to investigate, 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 question into a large set of ideas about how the world works.

      The scientist's knowledge must be exact. There is 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 change the scientist observes in a demonstration must be explained by the change in the conditions.

       This is one reason that investigations are important in science. Albert Einstein, who developed the theory of relativity, arrived at this theory through mathematics. The accuracy of his mathematics was later tested through investigation. Einstein's ideas are shown to be correct. A scientist uses many tools for measurements. Then the measurements are used to make mathematical calculations that may test his investigations.

 1."...knowing how to investigate, how to discover information, is important to everyone. " The author says this to show       .

      A. the importance of information

      B. the difference between carpenters and ordinary people

      C. the difference between scientists and ordinary people

      D. the importance of thinking

2.A sound scientific theory should be one that       .

    A. works under one set of conditions at any time

    B. leaves no room for improvement

    C. does not allow any change even under different conditions

   D. can be used for many purposes

 

3.Which of the following statements is NOT tree?

   A. What works under one set of conditions at one time might work under the same conditions at other times.

   B. Tools which a scientist uses for measurements are used to make mathematical calculations that may test his investigations.

   C. A scientist should know more about other branches of knowledge to arrive in his achievement.

   D. Knowing how to investigate, how to discover information is important to scientists.

4. What is the main idea of the passage?

   A. Scientists are different from the ordinary people.

   B. The theory of relativity.

   C. Exactness is the secret of science.

   D. Exactness and way of using tools is the key to the making of a scientist.

 

Calculations, which are astronomically exact, have been made    with the use of computers.

A．possible

B．it possible

C．possibly

D．to be possible

 

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