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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热门试题

单项选择题

Two thousand years ago, a rich and powerful country met with floods and starvation because of ______

A．the soil of the country became barren
B．its empire fell
C．it cut too many trees down
D．the conquered land within its empire was poor and barren

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