ven hours to travel east-west from London to NY. The reason for the difference is an atmospheric phenomenon know as the jet(喷射) stream. The jet stream is a very high altitude wind which always blows from the west to the east across the Atlantic. The planes movement a constams air speed thus go faster in the west-east direction when the air moving with the wind than in the opposite direction.2 What would happen if the gravity on Earth was suddenly turned off? Supposing we could magically turn off gravity. Would buildings and other structures float away? What happened would depend on how strongly the things were attached to the Earth. The Earth is moving at quite a speed moving at over a thousand miles per hour. If you turn something round your head on a string, it goes around in a circle until you let go of the strong go of the string. Things not attacked to the Earth would fly off in a straight line . People in buildings would suddenly shoot upwards at a great speed until they hit the ceiling. Most things would fly off into space.

参考答案： A     答案解析：
1What information coa we get from the first passage?
 A.tis the iet stoomn that affeets how fast airplanes fly.  B.Planes go slower when they are moving with the wind.  C.It takes more time to fly from NY to London than from London to NY.  D.The jet stream always blows from the east to the west across the Atantic.  
参考答案： B     答案解析：
2The word“shoot”underlined in the 2nd passage probably means“ ”.
 A.send for  B.move quickly  C.come out  D.grow quickly  
参考答案： B     答案解析：
3It can be interred that without gravity .
 A.buildings and other structures would float away  B.trees and buildings would not so easily fly off  C.something around your head would not float away  D.everything outside buildings would fly off into space  
参考答案： D     答案解析：
4Where can wemost probably read this text?
 A.In s research paper  B.In a tort story.  C.In a travel magazine.  D.In a student’s book.   3、C American cities are similar to other cities around the world; In every country. Cities reflect the values of the culture. American cities are changing， just as American society is changing. After Wolld Wa Ⅱ,the population of most large American cities decreased; bowever. The populaton In omthe Sun Belt cities increased. Los Angeles and Houston are eitit where populatfon shife（转移）to and from the oity reflect the changing values of Amorican society. In the late 1940s and early 1950s,city residents（居民）became wealthier. They had more children so they needed more space, They moved out of their apartments in the city to buy their own homes. They bought houses in the suburbs（郊区）. Now things are changing. The children of the people who left the cities in the 1950s are now adults. Many, unlike their parents, want to live in the cities. They continue to move to Sun Belt cities and older ones of the Northeast and Midwest. Many young professionals are moving back into city. They prefer the city to the burbs because their jobs are there; or they jus enjoy the excitement and possibii that the city offers. his people shift is bringing problems as well as benefits. Countless poot people must leave their apartments in the city because the owners want to sell the buildings or make apartments for sale instead of for rent. In the 1950s, many poor people did not have enough money to move to the suburbs; now many of these s

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