1. According to this selection, which of the following constitutes the unique character of U.S.?
A)Its excessive use of air-conditioning.
B)Its advanced computerized civilization.
C)Its publics retreating into self-pursuit.
D)Its greatest contribution to human civilization.
2. According to the author, the chief consequence brought about by the wide application of air-conditioning is ____.
A)the loss of human capacity to adapt to changes in climate
B)the reduction of social communications of neighborhood life
C)the active life style of all its users
D)the decreased human production and power
3. The tone of this selection reveals that air-conditioning ____.
A)has little effect on its users
B)has more effect on body than on mind
C)brings more benefits than damage to its users
D)does harm as well as good to its users
4. Who benefits the least from air-conditioning according to the author?
A)Medical experts.
B)Manufacturers.
C)Factory laborers.
D)Consumers.
5. What is the authors overall attitude towards air-conditioning?
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