题目内容
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The moon, being much nearer to the Earth than the Sun, is the ______ cause of the tides.
A．principal
B．basic
C．initial
D．elementary
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The moon, being much nearer to the Earth than the Sun, is the ______ cause of the tides.
A．principal
B．basic
C．initial
D．elementary
A. principal B. basic C. initial D. elementary
Researchers are finding that______
A．heart disease and cancer are the most common killers of human being
B．blood pressure and brain function are decided by cycles of sun, moon and seasons
C．the functions of human bodies have much to do with nature
D．any change in human bodies goes systematically with changes in the environment
The sun also exerts its effect on the tide, being a lit fie less than half as much as the moon, although its mass is so much greater. When the moon and the sun are horizontal, the highest high tide occurs and when they are vertical the lowest low tide takes place.
The wind also plays an important part in the modification of the normal rise and fall of the tide. Thus these factors affect each other, either detracting or adding to the attractive forces to add or subtract from the weight of the tide. But the tides still move inexorably on, rising twice a day, getting a little later each day and posing a problem of correctly predicting their heights and lows.
Which of the following factors will not affect the time of the tide？
A．The position of the sun and the moon.
B．The mass of the moon.
C．The wind.
D．All of the above mentioned factors.
The sun also exerts its effect on the tide, being a little less than half as much as the moon, although its mass is so much greater. When the moon and the sun are horizontal, the highest tide occurs and when they are vertical the lowest tide takes place.
The wind also plays an important part in the modification of the normal rise and fall of the tides. Thus these factors affect each other, either detracting(转移) or adding to the attractive forces to add or subtract from the magnitude of the tide. One thing is certain: the tides move inexorably(不可阻挡) on, rising twice a day, shifting a little in time each day, and coutinually posing the problem of how to correctly predict their highs and lows.
The principal idea of this article is ______.
A．the attraction of the sun and the moon
B．the sun, the moon and the wind
C．the changing tides
D．the factors affecting the tides
Task 1
Directions: After reading the following passage, you will find 5 questions or unfinished statements, numbered 36 through 40. For each question or statement there are 4 choices marked A, B, C, and D. You should make the correct choice.
There are many reasons for tidal action; thus, tides are very complicated phenomenon involving many factors, all of which must be considered to predict tidal action in any one place at any given time. The alternate rise and fall of the surface of the seas and the oceans is mainly caused by the attractive force of the moon. When the attraction is great, the tide is high; conversely, when the attraction is minimal, the tide is low. Between the high tide and the low tide is a period of a little over six hours, being called during its rise a flood tide, and during its fall an ebb (退潮) tide.
The sun also exerts its effect on the tide, being a little less than half as much as the moon, although its mass is so much greater. When the moon and the sun are horizontal, the highest tide occurs and when they are vertical the lowest tide takes place.
The wind also plays an important part in the modification of the normal rise and fall of the tides. Thus these factors affect each other, either detracting (转移) or adding to the attractive forces to add or subtract from the magnitude of the tide. One thing is certain: the tides move inexorably (不可阻挡) on, rising twice a day, shifting a little in time each day, and coutinually posing the problem of how to correctly predict their highs and lows.
The principal idea of this article is ______.
A．the attraction of the sun and the moon
B．the sun, the moon and the wind
C．the changing tides
D．the factors affecting the tides
The harvest moon is the full moon on a day nearest the first day of autumn. Full or nearly full, it rises early in the evening for several nights in a row. It brings farmers well-lit evenings to harvest their crops.
The harvest moon can look huge. But does it really fill more of the sky than an ordinary full moon？
Why does the moon look bigger when it is near the horizon？ Our brains compare the size of the moon with the size of the objects we see on the horizon. We know that the distant mountains？ homes？ or skyscrapers are really very large. And？ since the moon is much farther away than is the distant landscape？ we “see the moon as being larger than it would otherwise look.”
1.To what do we compare the size of the harvest moon？
A.Mountains
B.Buildings
C.Homes
D.All of these
2.The main purpose of the article is to() .
A.inform
B.persuade
C.praise
D.convince
3.The author knew most people find the moon() .
A.mysterious
B.interesting
C.boring
D.so ordinary
4.The moon looks bigger if ().
A.it is autumn
B.it is near the horizon
C.homes are near
D.it is a clear night
5.The autumn moon______.
A.is more beautiful than it really looks
B.is the brightest object in the sky
C.rises slowly at dawn
D.helps farmers see as they harvest their crops
Which of the following factors does not affect the extent of the tides？
A．The composition of the shore soil.
B．The moon.
C．Time.
D．Place.
The person in the poem ______.
A．wants to see the moon very much
B．does not want to see the moon
C．wants to see the sun very much
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