题目内容
（请给出正确答案）
A.potential
B.observation
C.recognize
D.incident
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更多“a single distinct event”相关的问题
The next year his programmes were placed on to the Internet. Everyone was welcome to use them and improve them if they could. Programmers used his codes(编码)to work with different operating systems. New things like web browsers(浏览器)and search engines were developed. Between 1991 and 1994 the number of web pages rose from 10 to 100,000.
In 1994 Tim Berners-Lee formed the newly formed World Wide Web Consortium(协会)，or W3C. More than 200 leading companies and laboratories are represented(代表)by W3C. Together they make sure that everyone can share equally on the web. "The Web can help people understand the way that others live and love and are human. It helps us understand the humanity of people, "he says.
1. From the lines we can infer that Tim Berners-Lee is _____.
A. British
B. American
C. Swiss
D. French
2. The main idea of this passage is _____.
A. when the Internet came into being
B. how Tim Berners-Lee formed W3C
C. why computers develop so rapidly
D. how the World Wide Web started
3. Scientists began to communicate using e-mail _____.
A. in 1980
B. after the 1980s
C. before 1990
D. in the 1960s
4. He made up his mind to write a programme that would let people from across the world share information on a single place when _____.
A. he was a child
B. he studied in Oxford University
C. he formed W3C
D. he worked at a lab in Switzerland
5. Which of the following is NOT true? _____
A. The number of web pages rose very rapidly in the 1990s.
B. Tim's programmes were placed on to the Internet in 1990.
C. The World Wide Web will have an effect on the social development.
D. Tim Berners-Lee made a great contribution to the computer science.
| Most of the teaching equipment presented by the Hope Project, as well as the books,____made good use of in the village school. |
[ ] |
| A. has B. have C. have been D. has been |
| There was a sweet smell of incense (香) in the air as the wellmuscled man moved his legs into a position well behind his head.It was something that the human body really should not be able to do.But what else would you expect at the First World Yoga Championships？ On September 25，the world’s leading yoga experts arrived in the US to find out who was the best.But the real prize was to turn yoga into a proper Olympic event. “Yoga is a combination of bodybuilding，Miss World，Mr Universe and gymnastics，” said championship organizer Bikram Choudhury.“There are some 70 people from more than 20 countries competing in this event.Why not have yoga at the Olympics？” The public cannot decide whether or not Choudhury’s dream will come true.But he is right about one thing：yoga has become popular with young and old people all over the world.In the US alone,15 million people practise yoga.Everyone is at it，including Madonna and Ricky Martin. Yoga started in India more than 5,000 years ago.The name means “to join together”．That is to bring the body and mind together into one pleasing experience.The whole system of yoga is built on three things：exercise，breathing and meditation (沉思)． The yoga that we know today is mostly physical yoga.It’s seen as a type of exercise，but is different from sports like football or running.When we do yoga，we move our body into positions that stretch the muscles and joints，making them stronger. One of the best things about yoga is the fact that everyone can do it.To women，it means a flat stomach，more shapely legs and a graceful body.To men，it is a way of becoming stronger and more athletic. There are also speciallydesigned yoga classes for pregnant women or children suffering from mental disabilities，such as autism (孤独症)．As for teenagers，meditation and simple breathing exercises can help them learn to calm down，relax and concentrate better.But teenagers under 16 are not supposed to do the body exercises as it could have a bad effect on their natural growth. 小题1:What does the first paragraph mainly tell us？
A．Turning yoga into a proper Olympic event. B．Making all Americans practise yoga. C Winning the First World Yoga Championships. D．Getting the public support for promoting yoga. 小题3:Why does the author mention Madonna and Ricky Martin in the fourth paragraph？
|
Black Holes
Most scientists agree that black holes exist but are nearly impossible to locate. A black hole in the universe is not a solid object, like a planet, but it is shaped like a sphere (球体). Astronomers(天文学家) think that at the center of a black hole there is a single point in space with infinite (无限的) density (稠密). This single point is called a singularity (奇点). If the singularity theory is correct, it means that when a massive star collapses, all the material in it disappears into the singularity. The center of a black hole would not really be a hole at all, but an infinitely dense point.
Anything that crosses the black hole is pulled in by its great gravity.
Although black holes do exist, they are difficult to observe. These are the reasons.
？ No light or anything else comes out of black holes. As a result, they are invisible to a telescope.
？ In astronomical terms, black holes are truly. For example, a black hole formed by the collapse of a giant star would have an event horizon (视界) only 18 miles across.
？ The nearest black holes would be dozens of light years away from Earth. One light year is about 6 trillion (万亿) miles. Even the most powerful telescopes could not pick out an object so small at such a great distance.
In 1994 the Hubble Space Telescope provided evidence that black holes exist. There are still answers to be found, however, so black holes remain one of the mysteries of the universe.
Black holes are part of space. 查看材料
A.Right
B.Wrong
C.Not mentioned
A、potential
B、observation
C、incident
D、regulation
A、look into
B、certification
C、ensure
D、explosion
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