单项选择题

（）is the question of using existing resources to produce original and benefi cial solutions, ideas or products.

A. Creativity
B. Productivity
C. Application
D. Combination

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单项选择题

Recent studies have identified four major global environmental risks; acid rain, ozone depletion, deforestation and the greenhouse effect（）

A. recognized
B. proved
C. got rid of
D. multiplied

单项选择题

Professor Jeffrey's lecture on the recycling of waste paper and other garbage will show（）can still be improved．

A．that the municipal authorities have done
B．how those the municipal authorities have done
C．how what the municipal authorities have done
D．that how the municipal authorities have done