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Light travels at a speed (速度) which is about a million times faster than that of sound. In one second, light travels about 300,000 kilometers, but sound travels only 340 meters. You can get some idea of this difference by watching the start of a running match. If you stand quite far away from the starter (发令员), you can see smoke come from his gun before the sound reaches your ears.
The fast speed of light produces some strange facts. Sunlight takes about 8 minutes to reach us. If you look at the light of the moon tonight, remember that the light rays (射线) left the moon 1. 3 seconds before they reached you. The nearest star is so far away that light which you can see from it tonight started to travel to you 4 years ago at a speed of nearly 2 million kilometers every minute. The light from some of tonight's started on its journey towards you even before you were born.
So, if we want to be honest (诚实的), we can not say, “The stars are shining brightly tonight.” We have to say. “The stars look nice. They were shining four years ago but their light has just reached our earth.”
1．The best title of this passage is ________.
[ ]
A．Light Travels Faster Than Sound
B．Stars Are Far Away From Us
C．The Speed of Light
D．How Light Rays Travel
2．If you stand 200 meters away from a man who is lifting a gun to
start a running match, you will find out ________.
[ ]
A．light travels a million times faster than sound
B．the smoke of the gun gets into your sight after the sound of the gun-shot
C．sound travels less fast than light
D．the sound of the gun reached you at the same time with the light of the smoke
3．Sunlight obviously (明显的) ________ than the light of the moon.
[ ]
A．has to travel a greater distance (距离)
B．moves less quickly
C．travels much more quickly
D．is less powerful
4．The scientific way of saying ``The stars are shining brightly tonight" should be ________.
[ ]
A．the stars have been shining all the time
B．the stars seen tonight will be shining four years later
C．the stars which were shining long ago but are seen tonight
D．the starlight seen tonight could be seen four years ago
5．The light of the nearest star you see tonight has been ________ for years.
[ ]
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| Food is everywhere in our lives. There are advertisements for food 1 on TV and in magazines. It's not surprising that many people eat three big 2 a day, and then they have lots of snacks 3 . Doctors say that people 4 eat like pigs. They should eat like birds! It's good for you to have four or five small meals a day. You should eat small amounts of food by taking small bites while eating. It can be 5 for you to eat two or three big meals a day, but these food habits are very 6 to change. Some people never change their eating habits. Other people are 7 to change. When they go to a restaurant, they 8 boiled (煮熟的) fish or chicken, and vegetables. They don't eat a rare steak (牛排) and sour cream. Doctors say that boiled food are good for people. They are better than fried foods. Sometimes, people don't have 9 time to think about food. At lunchtime many people run into a fast-food restaurant for lunch and eat a hamburger and French fries. While they are eating, they drink a soft drink. They can eat up a whole meal in 10 20 minutes. This is good for their daily timetable. But it is not very good for their digestive system or their weight! | ||||
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Many people in the United States worry about their looks. For many people, looking nice also means to be 5. Other people worry about their health as many doctors 6 overweight is not good.
Most people want to find a faster and 7 way to take off fat, and books of this kind are very popular.
These books tell people how to lose weight. Each year a lot of new books like these are 8. Each one says it can easily help people take fat away.
Losing weight can be 9. Some overweight people go to health centers, like La Costa in California. Men and women 10 several hundred dollars a day at these health centers. People live there for one week or two, 11 exercise, eating different foods. Meals there may be just a little. All this works for losing weight.
12 4 days on the programme, one woman called Mrs. Warren lost 5 pounds (2.27kg). At $400 a day, she spent $320 to lose each pound. But she said she was still 13 to do so.
Health centers, books, medicines, operations, running and exercise machines all 14 a lot of money. So in the United States, losing weight may mean losing 15, too.
1 .A. less B. more C. nice D. fast
2. A. For B. So C. Or D. And
3. A. good B. useful C. hard D. easy
4. A. why B. what C. how D. when
5. A. high B. short C. thin D. fat
6. A. talk B. say C. speak D. tell
7. A. dearer B. harder C. shorter D. easier
8. A. taken B. given C. written D. copied
9. A. cheap B. expensive C. easy D. safe
10. A. pay B. cost C. take D. have
11. A. making B. taking C. playing D. using
12. A. Before B. In C. After D. At
13. A. sorry B. angry C. sad &nbs Vp; D. glad
14. A. need B. have C. use D. get
15. A. health B. time C. food D. money
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About 70,000,000 Americans are trying to lose weight. That is almost 1 out of every 3 people in the United States. Some people eat ___36__ food and they hardly(几乎不) have any fats or sweets. Others do running ,exercise with machines, take medicines, or even have operations(手术). ___37___ you can see losing weight is __38___ work, and it will also cost a lot of money. But ___39__ do many people in the United States want to lose weight?
Many people in the United States are worried about their look of the body. For many people， looking nice also means to be____40____ . Other people worry about their health as many doctors ___41____ overweight is not good.
Most people want to find an____42___ way to take off fat，and books of this kind are very popular. These books tell people how to lose weight. Each year a lot of new books like these are ___43___. Each one says it can easily help people take fat away.
Losing weight can be ___44___ . Some overweight people go to health centres， like La Costa in California. Men and women ____45____several hundred dollars a day at these health centres. People live there for one week or two，____46____ exercise， eating different foods. Meals there may be just a little. All these work for losing weight. ____47___ 4 days on the programme， one woman called Mrs. Warren lost 5 pounds （2.27kg）. At $ 400 a day， she spent $ 320 to lose each pound. But she said she was still ____48____ to do so.
Health centres， books， medicines， operations， running and exercise machines all ___49__ a lot of money. So in the United States， losing weight may mean losing ___50__ too.
36. A. less B. more C. nice D. fast
37. A. For B. So C. Or D. And
38. A. good B. useful C. hard D. easy
39. A. why B. what C. how D. when
40. A. high B. short C. thin D. fat
41. A. talk B. say C. speak D. tell
42. A. dearer B. harder C. shorter D. easier
43. A. taken B. given C. written D. copied
44. A. cheap B. expensive C. easy D. safe
45. A. pay B. cost C. take D. have
46. A. making B. taking C. playing D. using
47. A. Before B. In C. After D. At
48. A. sorry B. angry C. sad D. glad
49. A. need B. have C. use D. get
50. A. health B. time C. food D. money
查看习题详情和答案>>| 完形填空。 | ||||
| About 70,000,000 Americans are trying to lose weight (减肥). That is almost 1 out of every 3 people in the United States. Some people eat 1 food and they hardly have any fats or sweets. Others do running, exercise with machines, take medicines, or even have operations. 2 you can see losing weight is 3 work, and it will also cost a lot of money. But 4 do so many people in the United States want to lose weight? Many people in the United States worry about their look of the body. For many people, looking nice also means to be 5 . Other people worry about their health as many doctors 6 overweight is not good. Most people want to find an 7 way to take off fat, and books of this kind are very popular. These books tell people how to lose weight. Each year a lot of new books like these are 8 . Each one says it can easily help people take fat away. Losing weight can be 9 . Some overweight people go to health centres, like La Costa in California. Men and women 10 several hundred dollars a day at these health centres. People live there for one week or two, 11 exercise, eating different foods. Meals there may be just a little. All these work for losing weight. 12 4 days on the programme, one woman called Mrs. Warren lost 5 pounds (2.27kg). At $ 400 a day, she spent $ 320 to lose each pound. But she said she was still 13 to do so. Health centres, books, medicines, operations, running and exercise machines all 14 a lot of money. So in the United States, losing weight may mean losing 15 too. | ||||
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