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

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单项选择题
Action, gesture, eye and voice（）to the greater effectiveness of drama as compared with the novel．

A．distribute
B．contribute
C．attribute
D．constitute
单项选择题
To prevent flooding in winter the water flowing from the dam is constantly（）by a computer.

A. graded
B. managed
C. conducted
D. monitored
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