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 people who live in cities today are losing their senses of
smell, touch and taste. They can't smell the dirty air, they can't taste the
chemicals in their food. These senses are not as strong as before, when people
lived in the country and grew their own food. The city has changed that. What
will the underground city change us?
单选题
People will live under the ground because______.
【正确答案】
C
【答案解析】[解析] 从第一段的第四句话“Scientists also say that men can begin to live in cities under the sea, when there is not enough space on the land.(科学家们说，当陆地上的空间不够时，人们可能会开始在海下的地下城市生活。)可知人们将会在地下生活的原因是陆地的生活空间不够。因此C选项符合题意。
单选题
The passage tells us______.
【正确答案】
D
【答案解析】[解析] 由原文第一段的第五句话“Of course, these new cities will be very expensive, and difficult to build, but they are not impossible.(当然，这些新城市的建成会很贵，也很不容易，但并非不可能。)可以推断出，这篇文章告诉了我们建立地下城市会花很多钱并且非常难。故D为正确答案。
单选题
Some countries try to build some palaces under the ground so that people will be able to live there______.
【正确答案】
B
【答案解析】[解析] 由第一段的这句话“Already, some countries are building places to live under the ground so their people can go there if there is a new war”可知，一些国家建了地下城市后，人们就可以在战争爆发的时候去地下居住。因此B选项符合题意。
单选题
People will lose some senses under the ground because______.
【正确答案】
D
【答案解析】[解析] 由原文第二段中的“Scientists say that people who live in cities today are losing their senses of smell, touch and taste. They can't smell the dirty air, they can't taste the chemicals in their food. These senses are not as strong as before, when people lived in the country and grew their own food”可以推断出，人们各种感觉下降是因为不能在正常的光照下种植农作物，所以D选项符合题意。
单选题
In the author's opinion, the cities have changed people's senses except______.
【正确答案】
C
【答案解析】[解析] 从第二段的“Scientists say that people who live in cities today are losing their senses of smell， touch and taste”可以看出，城市生活唯独没有改变人们的视觉。因此C选项符合题意。