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  3. According to the passage, a greenhouse is built to A major cause of the increase in the greenhouse gases is

According to the passage, a greenhouse is built to A major cause of the increase in the greenhouse gases is

admin2009-06-15  8
问题 According to the passage, a greenhouse is built to
A major cause of the increase in the greenhouse gases is
选项 A、the burning of trees and crops.
B、the building of many greenhouses.
C、the burning of large quantities of coal and oil.
D、the flooding of large areas of the world.
答案C
解析
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