[单项选择]Many people in the world live in big cities, which are often dirty and difficult places to live in. So, some cities will get bigger. They will also get higher, and lower, because people will begin to live under the ground as well as in tall buildings. Scientists also say that men can begin to live in cities under the sea, when there is not enough space on the land. Of course, these new cities will be very expensive, and difficult to build, but they are not impossible. Already, some countries are building places to live under the ground so their people can go there if there is a new war. There are underground cities in Switzerland and China, built by the government to help some of the people live after a great war.
But will the people change if they live under the ground for a long time For example, some fish go blind if they live in the dark for a long time. People will not go blind, because there will be light underground, but they may change in some way. Scientists say that peop
A. the world are polluted
B. it’s dark there
C. they can’t see the far-away things
D. they can’t grow their own food in the sun

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[单项选择]Many people in the world live in big cities, which are often dirty and difficult places to live in. So, some cities will get bigger. They will also get higher, and lower, because people will begin to live under the ground as well as in tall buildings. Scientists also say that men can begin to live in cities under the sea, when there is not enough space on the land. Of course, these new cities will be very expensive, and difficult to build, but they are not impossible. Already, some countries are building places to live under the ground so their people can go there if there is a new war. There are underground cities in Switzerland and China, built by the government to help some of the people live after a great war.
But will the people change if they live under the ground for a long time For example, some fish go blind if they live in the dark for a long time. People will not go blind, because there will be light underground, but they may change in some way. Scientists say that peop
A. it’s neither hot nor cold there
B. they’ll be afraid of the war
C. there ’11 be less space on the ground
D. they’ll make their life comfortable

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[单项选择]

Many people in the world live in big cities, which are often dirty and difficult places to live in. So, some cities will get bigger. They will also get higher, and lower, because people will begin to live under the ground as well as in tall buildings. Scientists also say that men can begin to live in cities under the sea, when there is not enough space on the land. Of course, these new cities will be very expensive, and difficult to build, but they are not impossible. Already, some countries are building places to live under the ground so their people can go there if there is a new war. There are underground cities in Switzerland and China, built by the government to help some of the people live after a great war.
But will the people change if they live under the ground for a long time For example, some fish go blind if they live in the dark
A. it’s neither hot nor cold there
B. they’ll be afraid of the war
C. there ’11 be less space on the ground
D. they’ll make their life comfortable

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[填空题]Many people who live in cities say that they dislike city life. They say the city that they live in is {{U}} (11) {{/U}}, dirty and crowded. They are {{U}} (12) {{/U}} the traffic and the pollution in the air. But not many people {{U}} (13) {{/U}} in cities are happy when they have to stay in the country for two or three weeks. They {{U}} (14) {{/U}} the quiet, the clean air and the beautiful healthy surroundings, but they miss the stores and restaurants, the movie theater and the {{U}} (15) {{/U}} of the city.

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