81. The passage begins with ____.

1. the globalization of poverty
2. a new challenge to mankind
3. a new disease of civilization
4. the global phenomenon of weather change

82. From the illustration of China, the author is trying to tell us that ____.

1. Chinese citizens neglect their impact on greenhouse-gas emission
2. the pace of urbanization is being accelerated at an alarming rate
3. rapid urbanization will increase greenhouse-gas emissions
4. the building boom is running faster there than elsewhere

83. Which of the following can meet the demand by the rampant urbanization?

1. Shrinking cities by 80%-90%.
2. Building ultra-efficient buildings.
3. Restoring the conventional buildings.
4. Abandoning existing building technologies.

84. The author thinks highly of those poorer countries ____.

1. introducing the developed countries' green technologies
2. building megacities while promoting energy efficiency
3. staying away from modern building technologies
4. integrating their buildings with nature

85. China's struggle to clean up Beijing's air for the Olympics, according to the passage, is a convincing example of ____.

1. the inevitability of our clean and sustainable metropolitan future
2. the necessity of encouraging citizens to use public transportation
3. the urgency of addressing climate change in the developing countries
4. the importance of integrated thinking to meeting the challenges of urbanization

(Reference keys.)