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

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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

According to the passage, trees are useful to man mainly in three ways, the most important of which is that they can ______

A．keep him from the hot sunshine
B．prevent him from floods
C．make him draw quick profit from them
D．help him to keep from the attack of drought and floods