题目内容
Three 21 ago, my family got our first computer. 22 the beginning of this summer, I found it was too old and I wanted to get a 23 one. After my father. and I talked for a long time, he 24 . We went to many shops and read many ads. 25 we bought an HP computer.
During the first week, I noticed 26 our computer had some problems. I spent many hours 27 to fix it, but it 28 work. So I 29 to phone the HP company and ask them 30 to work out my problem. They told me to wait until the next morning because all their workers were 31 that day.
The next morning two workers came. It took them many hours to mend it, but the computer 32 did not work. My dad had no other way but to return the whole thing.
A few days later, we decided that I should go on the Internet and order some parts to build a new computer by 33 .
It was not an easy job for me to build a new computer. I tried many times, and in the end I was successful. From these setbacks(挫折), I have learned a lot. Now I believe that if the HP computer hadn't had any problems, 34 I would not have learned how to build the new one. Even though I spent lots of time on it, I know it wasn't 35 .
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解析
Four hundred years ago, an Italian scientist named Galileo Galilei became the first person to see the craters（环形山） on the moon. Galileo was one of the first people to use a telescope to study the sky. Since then, telescopes have become the most important tool used by astronomers. Scientists never stop finding new ways to make these instruments more powerful. In the next several years, two new telescopes with different purposes are to be used.
One of the telescopes, called Pan-STARRS, could save humans from dying out. Nick Kaiser, a scientist who works on the project, says the Pan-STARRS telescope has been designed to find “90 percent of all killer asteroids(小行星) near Earth”.
Pan-STARRS, like most telescopes, uses mirrors and lenses(透镜) to provide pictures of outer space. Giant mirrors are used to “gather” light. They reflect the light onto the lens of a camera, which can then record the image.
When completed, Pan-STARRS will include four telescopes which will be put on top of a mountain on the Hawaiian island of Maui. Only one telescope is in place and working now. Each telescope will take pictures of one patch of sky for about 30 seconds, and then move on to another patch. Every night, each telescope will take pictures of about 1,000 patches. Every week, each telescope will have photographed the whole sky.
Each of the four telescopes will take pictures of the same patches of sky. One telescope, working alone, may sometimes incorrectly show an asteroid. If there are three other telescopes working, astronomers can use them to see if there really is an asteroid coming our way. By using four telescopes instead of one, scientists hope to get a better picture of space. If a giant asteroid was identified, astronomers would try to break it up long before it reached Earth.
1. Galileo Galilei is mentioned to ____________.
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A．tell us the history of telescopes |
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B．introduce the topic of the passage |
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C．show people his contributions |
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D．tell us about the craters on the moon |
2. For what purpose is Pan-STARRS designed?
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A．To find more asteroids around Earth. |
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B．To help scientists know Earth better. |
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C．To find killer asteroids coming towards Earth. |
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D．To learn about asteroids in outer space. |
3.What is paragraph 3 mainly about?
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A．The use of mirrors in a telescope. |
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B．Why Pan-STARRS is different. |
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C．How telescope “gather” light |
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D．How a telescope works. |
4.How many patches is the whole sky divided into when Pan-STARRS is working?
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A．1,000 |
B．7,000 |
C．21,000 |
D．28,000 |
5. The four telescopes will take pictures of the same patches of sky because _____.
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A．one telescope often takes unclear pictures |
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B．one telescope may provide incorrect information |
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C．information from just one telescope is usually incorrect |
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D．no information is allowed to be identified based on single information |