精英家教网 > 高中英语 > 题目详情

       Wind is the great maker of waves.There are exceptions, such as the tidal(潮汐的) waves some­times produced by earthquakes under the sea.But the waves most of us know are produced by winds blowing over the sea.

       Now before constructing an imaginary life history of a typical wave, we need to know certain physical things about it.A wave has height, from trough (low point) to crest (high Point).It has length-the distance from this crest to that of the following wave.The period of the wave means the time it takes for succeeding crests to pass a fixed point.None of these things stays the same-for all depend upon the wind, upon the depth of the water and many other matters.

       The water that makes up a wave does not advance with it across the sea.Each drop of water turns around in a little circle with the passing of the wave, but returns very nearly to its original position.And it is fortunate that this is so.For if the huge masses of water that make up a wave actually moved across the sea, sailing would be impossible.

       If we want to find the speed of a wave, we may use the following way:

       Speed = wavelength × frequency

       Here, wavelength is the distance between two high points (crests), frequency means the number of cycles per second.

1.What causes waves?

      A.Earthquakes and nothing else.              B.Only wind.

      C.Wind causes most waves.                   D.Wind causes some waves.

2.Which of the following is true according to the passage?

      A.The water of a wave moves away across the sea.

      B.The water of a wave remains almost at the same place.

      C.The water of a wave goes with the passing of the wave.

      D.The length of a wave means the distance from the top of a wave to the bottom.

3.The speed of Wave 1 is 100 cm/s, frequency 10.The frequency of Wave 2 is 300, while its speed is twice that of Wave 1.Which of the following is right?

      A.The wavelengths of the two are equal.

      B.The wavelength of Wave 1 is 10 times longer than that of Wave 2.

      C.The wavelength of Wave 2 is longer than that of Wave 1.

D.The wavelength of Wave 1 is longer than that of Wave 2.

练习册系列答案
相关习题

科目:高中英语 来源: 题型:阅读理解

    International Weather Forecast(January 18 th,2008)   

    Paris Weather

    ·Today:Plentiful sunshine High 59F.Winds NE at 5 to 10 mph.

    ·Tonight:Generally clear.Low near 35F.Winds light and variable.

    ·Tomorrow:A mainly sunny sky.High 59F.Winds ENE at 5 to l0mph.

    ·Tomorrow night:A mostly clear sky.Low 36F,Winds light and variable.

    New York Weather   

    ·Today:Cloudy with rain and snow showers Temps nearly steady in the mid 30s.Winds SE at 5 to 10 mph.Chance of precip 40%.

    ·Tonight:Rain and snow showers this evening changing to rain showers overnight Low 34F.Winds ESE at 5 to 10 mph Chance of precip 60%.

    ·Tomorrow:Cloudy skies early will become partly cloudy later in the day.High around 45F.Winds WNW at l0 to 20mph.

    ·Tomorrow night:Partly cloudy early with increasing clouds overnight Low 29F.Winds W at 5 to10 mph.

    London Weather

    ·Today:Cloudy and windy.High 56F. Winds WSW at 20 to 30 mph.

    ·Tonight:Partly cloudy and windy.Low 43F.Winds W at 20 to 30 mph.

    ·Tomorrow:Windy with occasional light rain.High 58F.Winds SW at 20 to 30 mph.Chance of rain 70%.

    ·Tomorrow night:Cloudy and windy.Periods of light rain early.Low 54F.Winds WSW

at 20 to 30 mph,Chance of rain 60%.

    Sydney Weather

    ·Today:Cloudy with periods of rain.High 73F.Winds NE at 10 to 15 mph.Chance of rain 70%.Rainfall around a quarter of an inch.   

    ·Tonight:Rain.Low near 70F.Winds NNE at 10 to 15 mph.Chance of rain 70%.Rainfall near a quarter of an inch.

    ·Tomorrow:Showers in the morning with isolated thunderstorms arriving in the afternoon.High 78FWindsNNE at 5 to10 mph.Chance of rain 40%.

    ·Tomorrow night:An isolated thunderstorm possible during the evening.then occasional showers overnight.Low near 70F.Winds WNW at 5 to 10 mph..Chance of rain 40%.

65.Which city has the strongest wind on January 19th?

    A.Paris.                B.New York.         C.London.           D.Sydney.

66.There will be thunderstorms in Sydney oil       .

    A.the evening of January 18th                           B.the afternoon of January 18th

    C.the morning of January 19th                          D.the afternoon of January 19th

67.If you go on a tour on January l8th,which of the following places of interest is the most favorable according to the weather report?

A.The Eiffel Tower.                                  B.Statue of Liberty.

C.Big Ben.                                                 D.The Sydney Opera House.

查看答案和解析>>

科目:高中英语 来源: 题型:阅读理解

International Weather Forecast(January 18 th,2008)   

    Paris Weather

    ·Today:Plentiful sunshine High 59F.Winds NE at 5 to 10 mph.

    ·Tonight:Generally clear.Low near 35F.Winds light and variable.

    ·Tomorrow:A mainly sunny sky.High 59F.Winds ENE at 5 to l0mph.

    ·Tomorrow night:A mostly clear sky.Low 36F,Winds light and variable.

    New York Weather    

    ·Today:Cloudy with rain and snow showers Temps nearly steady in the mid 30s.Winds SE at 5 to 10 mph.Chance of precip 40%.

    ·Tonight:Rain and snow showers this evening changing to rain showers overnight Low 34F.Winds ESE at 5 to 10 mph Chance of precip 60%.

    ·Tomorrow:Cloudy skies early will become partly cloudy later in the day.High around 45F.Winds WNW at l0 to 20mph.

    ·Tomorrow night:Partly cloudy early with increasing clouds overnight Low 29F.Winds W at 5 to10 mph.

    London Weather

    ·Today:Cloudy and windy.High 56F. Winds WSW at 20 to 30 mph.

    ·Tonight:Partly cloudy and windy.Low 43F.Winds W at 20 to 30 mph.

    ·Tomorrow:Windy with occasional light rain.High 58F.Winds SW at 20 to 30 mph.Chance of rain 70%.

    ·Tomorrow night:Cloudy and windy.Periods of light rain early.Low 54F.Winds WSW

at 20 to 30 mph,Chance of rain 60%.

    Sydney Weather

    ·Today:Cloudy with periods of rain.High 73F.Winds NE at 10 to 15 mph.Chance of rain 70%.Rainfall around a quarter of an inch.   

    ·Tonight:Rain.Low near 70F.Winds NNE at 10 to 15 mph.Chance of rain 70%.Rainfall near a quarter of an inch.

    ·Tomorrow:Showers in the morning with isolated thunderstorms arriving in the afternoon.High 78FWindsNNE at 5 to10 mph.Chance of rain 40%.

    ·Tomorrow night:An isolated thunderstorm possible during the evening.then occasional showers overnight.Low near 70F.Winds WNW at 5 to 10 mph..Chance of rain 40%.

65.Which city has the strongest wind on January 19th?

    A.Paris.    B.New York.    C.London.     D.Sydney.

66.There will be thunderstorms in Sydney oil      

    A.the evening of January 18th      B.the afternoon of January 18th

    C.the morning of January 19th      D.the afternoon of January 19th

67.If you go on a tour on January l8th,which of the following places of interest is the most favorable according to the weather report?

    A.The Eiffel Tower.   B.Statue of Liberty. C.Big Ben.D.The Sydney Opera House.

查看答案和解析>>

科目:高中英语 来源:广西自治区模拟题 题型:完形填空

完形填空。
     I am not one who is frightened easily, but I must admit that one night I saw a figure th at really struck
terror into my heart.
     I   1   it was a cold moon - lit night when I was walking home. It was the first night of my whole life that
I had been outside   2    at such a late time. There were   3    few people on the road at night. Even during the
day, the road was used by only some. On that night, it seemed even   4  . While I was walking, I could hear
some   5   made by creatures that love the night world. I moved really fast towards home. It was   6   because
I was hungry. More importantly, I was eager to get back home for warmth. All of a sudden, I   7   an old lady
in a short distance away. Her   8   was covered with a white cloth. She was   9   to me, I think.
      I was a bit  10  . I wanted to know  11  she was there at that time of the late night. I stopped walking for
a while. As I  12   there, stories about ghosts (鬼) began to come to my mind one after  13 . I was soon   14  
 fear and started to run as fast as I could. When I reached home I could  15 speak. 
     The next day, however, I   16   that place again to make sure that the woman was not a ghost but indeed a
real person. But I could find no footprints there  17   a banana plant. I realized then that it was the banana plant
with its leaves moving in the gentle wind that  18   like a woman waving her hand. I had indeed made a fool of
myself; but after the  19  night's experience, this  20  was small relief to me.
(     )1. A. realized        
(     )2. A. alone          
(     )3. A. never          
(     )4. A. busier          
(     )5. A. noises          
(     )6. A. completely      
(     )7. A. made sense of  
(     )8. A. waist          
(     )9. A. smiling        
(     )10. A. mysterious    
(     )11. A. why            
(     )12. A. lay            
(     )13. A. another        
(     )14. A. addicted to    
(     )15. A. clearly        
(     )16. A. traveled      
(     )17. A. over          
(     )18. A. felt          
(     )19. A. previous      
(     )20. A. invention      
B. recognized       
B. asleep           
B. often           
B. noisier         
B. quarrels         
B. mainly           
B. caught sight of  
B. leg             
B. waiting         
B. cautious         
B. when             
B. sat             
B. other           
B. filled with     
B. easily           
B. visited         
B. without         
B. looked          
B. next             
B. achievement   
C. remembered    
C. awake          
C. seldom        
C. quieter        
C. songs          
C. obviously      
C. got ahead of  
C. head          
C. whispering    
C. conscious      
C. what          
C. stood          
C. others        
C. far from      
C. hardly        
C. appreciated    
C. than          
C. smelt          
C. last          
C. contribution 
D. reminded               
D. lonely                 
D. rarely                 
D. wider                  
D. voices                 
D. partly                 
D. took hold of           
D. hand                   
D. waving                 
D. curious                
D. how                    
D. walked                 
D. the other              
D. short of               
D. loudly                 
D. went                   
D. except                 
D. sounded                
D. following              
D. discovery            

查看答案和解析>>

科目:高中英语 来源: 题型:阅读理解

第二节完形填空(20小题;每小题1.5分,满分30分)

      阅读下面短文,从短文后各题所给的四个选项(A、B、C和D)中,选出可以填入空白处的最佳选项,并在答题卡上将该项涂黑。

       I am not one who is frightened easily, but I must admit that one night I saw a figure th at really struck terror into my heart.

I   36   it was a cold moon - lit night when I was walking home. It was the first night of my whole life that I had been outside   37   at such a late time. There were   38  few people on the road at night. Even during the day, the road was used by only some. On that night, it seemed even   39  . While I was walking, I could hear some   40   made by creatures that love the night world. I moved really fast towards home. It was   41   because I was hungry. More importantly, I was eager to get back home for warmth. All of a sudden, I   42   an old lady in a short distance away. Her   43   was covered with a white cloth. She was   44   to me, I think.

I was a bit   45  . I wanted to know   46   she was there at that time of the late night. I stopped walking for a while. As I   47   there, stories about ghosts (鬼) began to come to my mind one after   48  . I was soon   49   fear and started to run as fast as I could. When I reached home I could   50   speak.

The next day, however, I   51   that place again to make sure that the woman was not a ghost but indeed a real person. But I could find no footprints there   52   a banana plant. I realized then that it was the banana plant with its leaves moving in the gentle wind that   53   like a woman waving her hand. I had indeed made a fool of myself; but after the   54   night’s experience, this   55   was small relief to me.

36.A.realized        B.recognized       C.remembered     D.reminded

37.A.alone         B.asleep           C.awake           D.lonely

38.A.never               B.often         C.seldom         D.rarely

39.A.busier           B.noisier          C.quieter          D.wider

40.A.noises           B.quarrels        C.songs         D.voices

41.A.completely       B.mainly          C.obviously      D.partly

42.A.made sense of  B.caught sight of C.got ahead of     D.took hold of

43.A.waist         B.leg            C.head          D.hand

44.A.smiling         B.waiting         C.whispering       D.waving

45.A.mysterious       B.cautious        C.conscious      D.curious

46.A.why          B.when         C.what          D.how

47.A.lay            B.sat             C.stood         D.walked

48.A.another         B.other         C.others           D.the other

49.A.addicted to       B.filled with     C.far from       D.short of

50.A.clearly          B.easily               C.hardly          D.loudly

51.A.traveled        B.visited          C.appreciated      D.went

52.A.over          B.without         C.than          D.except

53.A.felt           B.looked          C.smelt         D .sounded

54.A.previous       B.next          C.last            D.following

55.A.invention      B.achievement   C.contribution     D.discovery

查看答案和解析>>

科目:高中英语 来源: 题型:阅读理解

 (05·全国ⅠE篇)

“Soon, you’re going to have to move out!” cried my neighbor upon seeing the largest tomato plant known to mankind, or at least known i: exactly; tab-stops: 105.0pt 189.0pt 273.0pn my neighborhood.
   One tiny 9-inch plant, bought for $1. 25 in the spring, has already taken over much of my rose bed, covering much of other plants, and is well on its way to the front door.
   Roses require a good deal of care, and if it weren’t for the pleasure they give, it wouldn’t be worth the work. As it is, I have a garden full of sweet-smelling roses for most of the year. bushes must be pruned(剪枝) in early spring, leaving ugly woody branches until the new growth appears a few weeks later. It was the space available(可用的) in the garden that led me into planting just one little tomato plant. A big mistake.
   Soil conditions made just perfect for roses turn out to be even more perfect for tomatoes. The daily watering coupled with full sun and regular fertilizing(施肥) have turned the little plant into a tall bush. The cage I placed around it as the plant grew has long since disappeared under the thick leaves.
   Now the task I face in harvesting the fruit is twofold; First, I have to find the red ones among the leaves, which means I almost have to stand on my head, and once found I have to reach down and under, pick the tomatoes and withdraw(缩回) my full fist without dropping the prize so dearly won. I found two full-blown white roses completely hidden as I picked tomatoes in June, but they were weak and the leaves already yellow for lack of light.
   Here I am faced with a painful small decision: To tear up a wonderful and productive tomato plant that offers up between ten and twenty ripe sweet tomatoes each day or say goodbye to several expensive and treasured roses. Like Scarlett in Gone With the Wind, I’ll think about th painful at tomorrow.
71. What ate the requirements for the healthy growth of roses?
   A. A lot of care and the right soil.
   B. Frequent pruning and fertilizing.
   C. Tomato plants grown alongside.
   D. Cages placed around the roots.
72. The writer planted the tomato because ______.
   A. it cost only $1. 25
   B. the soil was just right for it
   C. there was room for it in the garden
   D. the roses’ branches needed to be covered
73. This year the writer’s roses were ______.
   A. removed from the rose bed
   B. picked along with the tomatoes
   C. mostly damaged by too much sunlight
   D. largely hidden under the tomato plant
74. By saying “the prize so dearly won” in paragraph 5, the writer wants to ______.
   A. show the difficulty in picking the tomatoes
   B. show the hardship of growing the roses
   C. express her liking for the roses
   D. express her care for the tomatoes
75. In the situation described in the text, one good thing is that ______.
   A. the roses cost the writer little money
   B. the writer has a daily harvest of tomatoes
   C. someone will help the writer make the decision
   D. the writer can now enjoy both the roses and tomatoes

  

查看答案和解析>>

同步练习册答案