题目列表(包括答案和解析)
Take any long piece of paper. Now glue the ends of the paper together. You have made a ring.
Take a second long piece of paper. Twist(turn round)the paper once and glue the ends together. Now you have made a Mobius band. For people who study math,this band is special.
This strange band was first made in the 1800s by a German man named August Mobius. Mr Mobius studied math. He wanted to find a way to prove how this band works with math. Believe it or not,this band has only one surface. You can find t his out for yourself.
If you draw a line on the surface of the paper before you twist and glue it,the line is only on one side of the paper. The paper has two surfaces. However,if you draw a line after you make the Mobius band,you can follow the line around all sides of the paper. In other words,the Mobius band must have only one surface.
It is also kind of fun to see what happens when you cut the band. If you cut the Mobius band in half once down the line you dfew,you do not get two Mobius bands. Instead,after you cut the band,it turns into one large twisted ring. Then,if you cut this ring in half along the middle of the band again,you get two connected Mobius bands.
Try it
1.What is a Mobius band?
A.A musical group.
B.An interesting twisted ring.
C.A long piece of paper.
D.Glue.
2.August Mobius________.
A.studied math
B.was a German
C.made the first Mobius band
D.all of the above
3.How can you see that the Mobius band has only one side?
A.Cut it.
B.Glue it.
C.Draw a line on it.
D.Twist it.
4.What do you get if you cut the Mobius band in half once?
A.One large twisted ring.
B.Two Mobius bands.
C.A long piece of paper.
D.A short piece of paper.
5.What do you get if you cut the Mobius band in half twice?
A.One large twisted ring.
B.Two Mobius bands.
C.A long piece of paper.
D.A shart piece of paper.
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1. Summer came early to Middlesbrough yesterday, as temperatures shot up to 22°C (71°F), a record for March. But local NFU agent Jim Wilkes says it could be bad news for farmers. “The crops will think it's summer,” he told our reporter, “and start sprouting (发芽) four weeks before time.”
2. The death toll (死亡人数) of the Burnside train crash rose to four yesterday when John Phillips, 32, of Petersville died in Wallsend Hospital. Another six people are still on the danger list. Mr. Phillips, an electrical engineer leaves a wife and two children.
3. China and the United States reached an agreement on the protection of intellectual property rights (知识产权) yesterday, after difficult marathon talks.
The agreement is good news for all parties concerned. The Chinese Foreign Trade Minister described the agreement as a "turning point" in Sino-US trade relations that "promises further progress" in the future. The agreement will not only favorably influence trade relations between China and the United States. It may favorably influence the overall relations between the two countries.
1.What do you get to know from article 1?
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A.It is as cold as usual in Middlesbrough, and the farmers are pleased. |
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B.It is hotter than usual in Middlesbrough, and the farmers are pleased. |
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C.It is hotter than usual in Middlesbrough, and the farmers are worried. |
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D.It is colder than usual in Middlesbrough, and the farmers are worried. |
2.How many people have died in the train crash in article 2 ?
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A.Only John Phillips has died. |
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B.Ten people have died in the crash, including John Phillips. |
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C.Four people have died in the crash, including John Phillips. |
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D.John Phillips, his wife and children all died in the crash. |
3.Who are on the danger list?
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A.Petersville and Wallsend. |
B.An electrical engineer and John Phillips. |
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C.John Phillips' wife and two children. |
D.Another six people who were on the train. |
4.What agreement did China and the United States reach in article 3?
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A.It is an agreement on a marathon race. |
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B.It is an agreement on trade relations. |
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C.It is an agreement on overall relations. |
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D.It is an agreement on intellectual property rights protection. |
5.What are relations going to be like between China and the United States?
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A.Relations between China and the United States are going to be sometimes worse and sometimes better. |
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B.Relations between China and the United States are going to be better. |
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C.Relations between China and the United States are going to be worse. |
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D.Relations between China and the United States are going to remain the same. |
--- What do you think if we put both John and Jack in charge of the work?
--- Just John is OK. , you know.
A.Every dog has his day
B.Everybody’s business is nobody’s business
C.Fools have fortune
D.Great hopes make great men
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