题目内容
（请给出正确答案）
A．Rising tides
B．Because the rising tide
C．The tide is rising
D．The rising tide
E．The rising of the tide
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Tides are superimposed on nontidal rising and falling water levels，caused by ______．
A.freshets
B.floods
C.river flows
D.seismic events
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 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.
Italian experts are proposing a dramatic new solution to the watery threat facing the city of Venice. Rather than battling to keep the sea out—they want to use it to help raise the sinking island-city.
(33) The scheme would~ involve pumping huge quantities of sea water into the ground beneath Venice down 12 pipes each of which would be 700m long. The sea water would make the sand beneath the city expand lifting Venice by 30cra in 10 years.
(34)Now, a panel of engineers and geologists from the respected University of Padua have come up with the new scheme costing just a fraction of that—100m euro.
It says the plan would help raise Venice by almost as much as it has sunk over the past three centuries. The professor leading the project says it is not an alternative to the floodgates - but would work in collaboration with them. Be now wants to carry out a trial to see if the theory would work in practice.
Not everyone is convinced. (35) One expert—who helped stabilize the leaning Tower of Pisa—described the scheme as pure science fiction and warned it could damage the fragile structure of Venice. But the city's mayor is interested. He says it is time to look again at how to raise the city—and is convinced that the technology exists to make it a reality.
(33)
A．Building floodgates to keep the sea out.
B．Stopping the sea level rising.
C．Raising the sinking city of Venice.
D．Saving the city from flooding.
What is the news item mainly about？
A．The passing of economic stimulus bill.
B．The high unemployment in America.
C．The recovery of American economy.
D．The recession of American economy.
听力原文： Today, I would like to begin by discussing early European settlement along one of our well-known rivers, the Hudson, which empties into the Atlantic to form. New York Bay. The Hudson River has a couple of interesting physical features that made it very attractive for settlement by the Europeans. The first is that the river extends inland from the Atlantic Ocean for more than 150 miles with no waterfalls or rapids. Its surface is virtually flat for that entire distance, with no obstacles. Second, the whole 150-mile stretch is influenced by tides from the Atlantic Ocean Roughly every six hours, the river reverses direction, flowing north when the tide is rising and south toward the ocean when the tide is going down. Obviously there were no obstacles to prevent settlers from moving further upstream on the Hudson River and this explains why the Dutch penetrated so far inland. They were the first Europeans to settle in the Hudson valley. Of course, to go upstream, the Dutch settlers needed' the right kind of boat, and so to navigate the river, they design a sloop with only one mast but with two sails, one rigged in front of the mast and one behind. The mast was very tall, in many cases over 100 feet tall, so that the large sails could catch winds blowing above the shore line hills. Hudson River sloops carried passengers and cargo. The cargo ranges from coal, lumber and hay to fruit, vegetables and livestock. Traveling only ten miles an hour in a good wind, the sloop was not too speedy by modern standards, but it was ideally suited to the Dutch settlement, and in fact when the stream boat eventually was introduced, it couldn't keep up with the sloop.
(33)
A．The strength of its shipbuilding industry.
B．The physical features of the river itself.
C．The abundance of fruit, vegetables, and livestock.
D．The similarity of climate to that in Europe.
Does the crab actually keep time, or does its skin simply answer to the sun's rays, changing color according to the amount of light that strikes it？ To find the reason out, biologists kept crabs fo a dark room for two months.Even without daylight the crab's skin color continued to change exactly on time.
This characteristic probably developed gradually in answer to the daily rising and setting of the sun, to help protect the crab from sunlight and enemies.After millions of years it has become completely regulated inside the living body of the crab.
The biologists noticed that once each day the color of the fiddler crab is especially dark, and that each day this happens fifty minutes later than on the day before.From this they discovered that each crab follows not only the rhythm of the sun but also that of the tides.The crab's period of greatest darkening is exactly the time of low tide on the beach where it was caught!
21.The fiddler crab is like a clock because it changes color ().
A.in a regular 24-hour rhythm
B.in answer to the sun's rays
C.at low tide
D.every fifty minutes
22.The crab's changing color ().
A.tells the crab what time it is
B.protects the crab from the sunlight and enemies
C.keeps the crab warm
D.is of no real use
23.When the fiddler crabs were kept in the dark, they ().
A.did not change color
B.changed color more quickly
C.changed color more slowly
D.changed color on the same timetable
24.The crab's color-changing ability was probably developed ().
A.in the process of evolution
B.over millions of years
C.by the work of biologists
D.both A and B
25.The best title for this selection would be ().
A.The Sun and the Tides
B.Discoveries in Biology
C.A Scientific Study
D.A Living Clock
The public agencies for adult education will be little better off because______.
A．the unemployed are too poor to continue their education
B．a new leisure class has developed
C．they are still suffering from the depression
D．an increase in taxes could be a problem
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