Halley's Comet (慧星) completed its latest trip ar...

第1题

简述慧星的特征

点击查看答案

第2题

表述慧星结构特点

点击查看答案

第3题

肝脓肿USG检查可见 ()

A、晕环征

B、环中环征

C、慧星尾征

D、靶征

E、蝌蚪尾征

点击查看答案

第4题

Halley's Comet (慧星) completed its latest trip around the Earth in 1986. It is now speeding toward the far-distant edges of our solar system. People on Earth will not be able to see it again until 2062. Scientists in many countries waited and prepared for years for the return of Halley's Comet. They planned new ways to observe the comet as it came near the Earth. Comets are of great interest to scientists. This is because the space objects are believed to have changed very little since the solar system was formed 4,600 million years ago. Scientists believe that if they can learn more about the elements in a comet, they will understand more about conditions when the solar system was new. Halley's Comet is probably the most famous comet. Historians say it was first noted about 2,200 years ago. The visit of the bright space object has been observed and recorded every 76 years since then. The comet was named after British scientist Edmund Halley. In the early 1700s, Halley studied records of the appearance of huge balls of fire flying across the sky. And he studied the sky to make his own observations. Halley was the first person to recognize that the balls of fire were really the same bright object, a comet. Halley said the comet circled the sun just as the planets did. And he said the comet's trip around the sun took about 76 years. Since the discoveries by Edmund Halley, people have waited for that bright comet to return. When it came, people looked at it through small telescopes (望远镜) they held in their hands. And scientists looked at it through huge telescopes placed on top of mountains where the air was clear. But the most recent visit of Halley's Comet was the first time scientists could study the comet up very close. They did this through scientific instruments sent into space. 11. Halley's Comet is ________.

A、a planet

B、fire in space

C、a star

D、a bright space object

点击查看答案

第5题

It was so quick and easy. A fourteen-year-old boy in Scottsdale, Arizona, put his $50 bill on a color copying machine. Within seconds he transformed $50 into $550, and he was ready to shop. Twenty years ago only a few people had the skills or equipment to make fake money. Today computer, copier, and printer technology is so good that almost anyone can "make" money. With the new technology there is a new kind of casual faking machine. These machines are called casual because they don't have special skills and because they don't need to plan much. The number of bills made by casual fakers on their home or office computer is growing fast. In fact, this number has doubled every year since 1989! There is no way to stop faking 100 percent. But the government has recently found a few ways to make casual faking very difficult. One way is to put very, very small words, called microprints(微型印刷品), in hidden places on the bill. The words are only 6/1000 inch. No one can read them without a magnifying glass, a special glass that makes things look bigger. And they are too small to come out clearly on a copier. If someone copies a bill that has microprints and you look at the copy through a magnifying glass, instead of microprinted words, you will see only black lines. Another way to stop people from making fake money on their home computers is to use special color-changing ink. Money printed with color-changing ink will look green from one angle and yellow from another. Home computers cannot use color-changing ink. So any copies from a home computer will have normal ink and can be noticed quite easily. Additionally, money is made on special paper with very small pieces of red and blue silk mixed in. And on each bill there is a special line that runs from the top to the bottom of the bill. Suppose, for example, that you hold a $20 bill up to the light. If you do this, you can see the line has the words "USA twenty". The line turns red if you put it under a special light. This line and the special paper with red and blue silk are not easy for home computers to copy. The government must try many different ways to stop faking. It needs to keep changing the way money is made because fakers can learn to copy the changes. Today copiers can't copy microprinted words or color-changing ink. But, in a few years, who knows? 10. The author ends the article with ________.

A、a conclusion

B、an idea and a worry

C、a prediction

D、a review

点击查看答案

第6题

Halley's Comet (慧星) completed its latest trip around the Earth in 1986. It is now speeding toward the far-distant edges of our solar system. People on Earth will not be able to see it again until 2062. Scientists in many countries waited and prepared for years for the return of Halley's Comet. They planned new ways to observe the comet as it came near the Earth. Comets are of great interest to scientists. This is because the space objects are believed to have changed very little since the solar system was formed 4,600 million years ago. Scientists believe that if they can learn more about the elements in a comet, they will understand more about conditions when the solar system was new. Halley's Comet is probably the most famous comet. Historians say it was first noted about 2,200 years ago. The visit of the bright space object has been observed and recorded every 76 years since then. The comet was named after British scientist Edmund Halley. In the early 1700s, Halley studied records of the appearance of huge balls of fire flying across the sky. And he studied the sky to make his own observations. Halley was the first person to recognize that the balls of fire were really the same bright object, a comet. Halley said the comet circled the sun just as the planets did. And he said the comet's trip around the sun took about 76 years. Since the discoveries by Edmund Halley, people have waited for that bright comet to return. When it came, people looked at it through small telescopes (望远镜) they held in their hands. And scientists looked at it through huge telescopes placed on top of mountains where the air was clear. But the most recent visit of Halley's Comet was the first time scientists could study the comet up very close. They did this through scientific instruments sent into space. 15. Which of the following statements is NOT true?

A、People will be able to see Halley's Comet in 2062.

B、Halley's Comet was first noted about 2,200 years ago.

C、Halley's Comet was named by British scientist Edmund Halley.

D、Halley's Comet circles the sun.

点击查看答案

第7题

Halley's Comet (慧星) completed its latest trip around the Earth in 1986. It is now speeding toward the far-distant edges of our solar system. People on Earth will not be able to see it again until 2062. Scientists in many countries waited and prepared for years for the return of Halley's Comet. They planned new ways to observe the comet as it came near the Earth. Comets are of great interest to scientists. This is because the space objects are believed to have changed very little since the solar system was formed 4,600 million years ago. Scientists believe that if they can learn more about the elements in a comet, they will understand more about conditions when the solar system was new. Halley's Comet is probably the most famous comet. Historians say it was first noted about 2,200 years ago. The visit of the bright space object has been observed and recorded every 76 years since then. The comet was named after British scientist Edmund Halley. In the early 1700s, Halley studied records of the appearance of huge balls of fire flying across the sky. And he studied the sky to make his own observations. Halley was the first person to recognize that the balls of fire were really the same bright object, a comet. Halley said the comet circled the sun just as the planets did. And he said the comet's trip around the sun took about 76 years. Since the discoveries by Edmund Halley, people have waited for that bright comet to return. When it came, people looked at it through small telescopes (望远镜) they held in their hands. And scientists looked at it through huge telescopes placed on top of mountains where the air was clear. But the most recent visit of Halley's Comet was the first time scientists could study the comet up very close. They did this through scientific instruments sent into space. 12. Which is the best topic of this passage?

A、What Is a Comet?

B、Halley's Comet

C、The Discovery of Halley's Comet

D、How Halley's Comet Was Discovered

点击查看答案

第8题

Florida International University has opened what it says is the first computer art museum in the United States. You don't have to visit the University to see the art. You just need a computer linked to a telephone. You call the telephone number of a University computer and connect your own computer to it. All of the art is stored in the school computer. It is computer art, created electronically by artists on their own computers. In only a few minutes, your computer can receive and copy all the pictures and drawings. Robert Shostak is the director of the new computer museum. He says he started the museum because computer artists had no place to show their work. A computer artist could only record his pictures electronically and send the records, or floppy discs, to others to see on their computers. He could also put his pictures on paper. But to print good pictures on paper, the computer artist needed an expensive laser printer. Robert Shostak says the electronic museum is mostly for art or computer students at schools and universities. Many of the pictures in the museum are made by students. Mister Shostak said the Florida International University museum will make computer art more fun for computer artists because more people can see it. He says artists enjoy their work much more if they have an audience. And the great number of home computers in America could mean a huge audience for the electronic museum. 17. After connecting your own computer to the computer art museum, you can _______.

A、only appreciate the art

B、improve on the art

C、make comments on the paintings

D、download the paintings

点击查看答案

第9题

Halley's Comet (慧星) completed its latest trip around the Earth in 1986. It is now speeding toward the far-distant edges of our solar system. People on Earth will not be able to see it again until 2062. Scientists in many countries waited and prepared for years for the return of Halley's Comet. They planned new ways to observe the comet as it came near the Earth. Comets are of great interest to scientists. This is because the space objects are believed to have changed very little since the solar system was formed 4,600 million years ago. Scientists believe that if they can learn more about the elements in a comet, they will understand more about conditions when the solar system was new. Halley's Comet is probably the most famous comet. Historians say it was first noted about 2,200 years ago. The visit of the bright space object has been observed and recorded every 76 years since then. The comet was named after British scientist Edmund Halley. In the early 1700s, Halley studied records of the appearance of huge balls of fire flying across the sky. And he studied the sky to make his own observations. Halley was the first person to recognize that the balls of fire were really the same bright object, a comet. Halley said the comet circled the sun just as the planets did. And he said the comet's trip around the sun took about 76 years. Since the discoveries by Edmund Halley, people have waited for that bright comet to return. When it came, people looked at it through small telescopes (望远镜) they held in their hands. And scientists looked at it through huge telescopes placed on top of mountains where the air was clear. But the most recent visit of Halley's Comet was the first time scientists could study the comet up very close. They did this through scientific instruments sent into space. 14. The most recent appearance of Halley's Comet was different because scientists could study the comet using ______________.

A、instruments sent into space

B、telescopes they held in their hands

C、huge telescopes on top of mountains

D、space stations that could get them very close

点击查看答案

第10题

Florida International University has opened what it says is the first computer art museum in the United States. You don't have to visit the University to see the art. You just need a computer linked to a telephone. You call the telephone number of a University computer and connect your own computer to it. All of the art is stored in the school computer. It is computer art, created electronically by artists on their own computers. In only a few minutes, your computer can receive and copy all the pictures and drawings. Robert Shostak is the director of the new computer museum. He says he started the museum because computer artists had no place to show their work. A computer artist could only record his pictures electronically and send the records, or floppy discs, to others to see on their computers. He could also put his pictures on paper. But to print good pictures on paper, the computer artist needed an expensive laser printer. Robert Shostak says the electronic museum is mostly for art or computer students at schools and universities. Many of the pictures in the museum are made by students. Mister Shostak said the Florida International University museum will make computer art more fun for computer artists because more people can see it. He says artists enjoy their work much more if they have an audience. And the great number of home computers in America could mean a huge audience for the electronic museum. 16. The first computer art museum in the U.S.A. was opened by _______.

A、a university

B、some artists

C、a computer designer

D、the local government

点击查看答案

功能	扣减规则
功能	基础费（查看答案）	加收费（AI功能）
文字搜题、查看答案	1/每题	0/每次
语音搜题、查看答案	1/每题	2/每次
单题拍照识别、查看答案	1/每题	2/每次
整页拍照识别、查看答案	1/每题	5/每次

Halley's Comet （慧星) completed its latest trip ar...