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Beyond two or three days, the world’s best weather forecasts are doubtful, and beyond six or seven they are worthless.

The Butterfly Effect is the reason. For small pieces of weather―to a global forecaster, small can mean thunderstorms and blizzards (暴风雪)―any prediction becomes worse rapidly. Errors and uncertainties increase, from dust devils and storms up to continent-size eddies (旋涡) that only satellites can see.

The modern weather models work with net-like points sixty miles apart, and even so, some starting data have to be guessed, since ground stations and satellites cannot see everywhere. But suppose the earth could be covered with sensors placed one foot apart, rising at one-foot intervals all the way to the top of the atmosphere. Suppose every sensor gives perfectly accurate readings of temperature, pressure, humidity (湿度), and any other data a weatherman would want. Exactly at noon a powerful computer takes all the data and calculates what will happen at each point at 12.01, then 12.02, then 12.03… the computer will still be unable to predict whether Princeton will have sun or rain one month away. At noon the spaces between the sensors will hide fluctuations (波动) that the computer will not know about. By 12.01, those fluctuations will already have created small errors one foot away. Soon the errors will have added to the ten-foot scale, and so on up to the size of the globe.

 

72.A weather forecast ______ in the world.

A.is reliable within one or two days           

B.is doubtful beyond 24 hours

C.becomes useless beyond two or three days                                

D.is still worthwhile in seven days

73.Usually there is a weather sub-station ______.

A.in every city                                         B.every 60 miles

C.between two cities                                D.every one foot

74.Which of the following statements is true?

A.People have not placed sensors one foot apart in the atmosphere.

B.Scientists have already put sensors one foot apart in the world.

C.Every sensor gives perfectly accurate data a weatherman wants.

20090531

D.Ground weather stations and satellites can see every place on earth.

75.Our computer will not be able to know about fluctuations because ______.

A.the sensors are not good enough           

B.they are hidden by the spaces between the sensors

C.they are too far away                          

D.they move very fast      

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D
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  The Butterfly Effect is the reason. For small pieces of weather—to a global forecaster,small can mean thunder—storms and blizzards(暴风雪)—any prediction becomes worse rapidly. Errors and uncertainties increase,from dust devils and storms up to continent-size eddies(旋涡)that only satellites can see.
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A.in every city           B.every 60 miles
C.between two cities         D.every one foot
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B.Scientists have already put sensors one foot apart in the world.
C.Every sensor gives perfectly accurate data a weatherman wants.
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1. The underlined word “outlawed” in paragraph 2 probably means “           ”.

A.allowed

B.forbidden

C.offered

D.refused

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

A.Americans used to get access to the Internet easily.

B.The world’s TV sets will total 150 million by 2013.

C.45% of families in the developing countries had a TV in 2005.

D.Over two thirds of families in the world will have a TV by 2013.

3.The author intends to             .

A.stress the advantages of TV to people’s lives

B.persuade women to become more independent

C.encourage people to improve their reading skills

D.introduce the readers some websites such as Google

4. What would be the best title for the passage?  

A.TV Will Rule the World

B.TV Will Disturb the World

C.TV Will Better the World

D.TV Will Remain in World

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A.It is impossible for women in India to get access to TVs now.

B.Robert Jensen and Emily Oster are Indian women.

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