People are moving from major cities to smaller ones.

The author mentions big cities such as Tokyo, Singapore and Paris______.

A. to show that city people all over the world have a lot in common

B. to let his readers be aware that they are some of the world's biggest cities

C. to illustrate their difference from American cities

D. because they are some of the cities that attract visitors most

Millions of people in many countries are moving to cities because they need to find work.()

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 same people do not have enough money to stay in the cities.

Only a few years ago, people though that the older American cities were dying. Some city residents now see a bright, new fiture, Others see only problems and comfiels the thing is sure many dying cities are alive again.

64. What does the author think of cities all over the world?

A. They are alive.

B. They are hopeless.

C. They are similar.

D. They are different.

Which of the following statements is TRUE according to the passage?

A. Some companies in the United States moved to Sweden, Germany and Belgium.

B. Fresh air, spacious room and being away from others attract people to move to the suburbs.

C. People wouldn't pay tax when they moved out of cities.

D. The neighborhood should be maintained by old and poor people.

Air pollution

People and air pollution are often in the same places. This means that cities with large populations have the biggest problem of dirty air. Air pollution is caused by many different things. A major kind of air pollution is the gas from cars. Statistics(统计资料) show that 93 percent of all auto trips are within cities.

Another major kind of dirty air is the burning of coal and oil for energy. This energy is needed to make electricity. Of course, much more electricity is used in the city than in the county.

On the average, we throw away more rubbish than the year before. The burning of rubbish makes air pollution even worse. Many major industries are also responsible for the dirty air in the around cities. The fumes(烟)from iron, steel, chemical, and petrol production add particles(微粒)to the air.

The effects of air pollution range from mild headaches to death. The levels of pollution found in heavy traffic may cause headaches for loss of clear vision. Wherever coal and oil are used for fuel, fumes may kill trees and plants and cause metal to corrode(腐蚀). In some of the larger cities, these fumes endanger the lives of human beings by contributing to lung diseases and causing early death.

26. The key point of the passage is that().

A. the cause of air pollution is people

B. the causes and the effects of air pollution are both found in cities

C. the effects of air pollution range from headaches to death

27. What is the purpose of this passage?

A. to persuade people to stop polluting the air().

B. to tell the causes of air pollution

C. to tell why cities are bad places to live

28. Why is air pollution more grave in the city than in the country?().

A. Because there are larger populations in cities.

B. Because the air in the city is dirty.

C. Because there are much more gas fumes from cars and burning of coal and oil for energy in the city than in the country.

29. The fumes from coal and oil may cause metal().

A. to corrode

B. to twist

C. to turn black

30. In larger cities, the fumes from coal and oil may contribute to().

A. heart disease

B. loss of clear vision

C. lung diseases

29． The writer thinks that people in large cities should __________ ．

A． stop the used water from getting into underground

B． only use the water from the rivers

C． make their used water clean again

D． use as much sea water as possible

The population of cities in developing nations is getting smaller.()

We ear comude from the text that .

A. American cities are changing far the worse

B. people have different views on American cities

C. many people are now moving from American cities

D. the population is decreasing in older American cities

The medium-sized and smaller cities are not so much suitbale for large conventions as Beijing and Shanghai.()