单项选择题

It's very pitiful that ______

A．man has cut down too many trees
B．man is eager to profit from trees
C．man hasn't realizes the importance of trees to him
D．man hasn't found cut that he has lost all trees

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热门试题

单项选择题

When there is a heavy rain, trees can help to prevent floods, as they can ______

A．keep rain from falling down to soft ground
B．cause the soil to allow rainwater to sink in
C．make the topsoil stick together
D．prevent the soil from being washed away

单项选择题

Sooner or later the forests will disappear ______

A．if people don't stop cutting trees
B．unless a country has a plenty supply of trees
C．unless all people the importance of planting trees and the government has good system of control.
D．if man doesn't stop cutting trees carelessly