It is reported that half the world’s forests have already been destroyed. This widespread destruction is due to deforestation (采伐森林). Deforestation is the removal of a forest or group of trees where the land is later transformed to a non-forest use. Cutting down trees is necessary for man’s survival. However, deforestation has a number of negative effects on the environment and needs to be controlled.

There are two main purposes for cutting down trees and one of them is to use the trees as resources. Essential items like paper, furniture and charcoal are all made from trees. Deforestation is also carried out to clear land for farming and to make room for roads and houses. As the population grows, more of the forest has to be cleared.

Although deforestation is necessary up to a point, it has some negative effects on the environment. Firstly, cutting down forests destroys animal habitats, leaving them with no place to live in. Deforestation also allows erosion to occur, which leaves the land easy to landslides and makes it difficult for plants to grow there. Finally, the removal of trees also worsens air pollution. Trees act as natural air filters that change carbon dioxide into oxygen. When they are removed, carbon dioxide can build up and pollute the atmosphere. Hence, it is obvious that deforestation harms the environment.

Due to the harm deforestation causes, it is necessary to control it. There are a number of ways to do this. One of them is to make better use of farming land. That means we do not need as much land for farming, and hence do not need to cut down so many trees. There must also be laws to limit deforestation and these laws must be enforced strictly. On top of that, reforestation must be carried out systematically. This method involves planting new trees and plants in areas where deforestation has occurred to replace what was destroyed.

To sum up, although deforestation must be carried out, it can harm the environment and must be controlled. Beyond a certain point, this damage to the environment cannot be fixed. Hence, we should do our best to make sure that the damage is never too great to fix.

【小题1】What is the second paragraph mainly about?

A．How people get farmland.

B．What trees mean to human beings.

C．Why people carry out deforestation.

D．What effect deforestation has on environment.

【小题2】What consequence may deforestation bring to animals according to the text?

A．Homelessness.

B．Extinction.

C．Disease.

D．Wars.

【小题3】According to the text, how can we control the harm of deforestation?

A．By replacing new trees.	B．By banning deforestation.
C．By passing laws to limit farmland.	D．By making the best of farmland.

【小题4】What may be the worst result if deforestation is beyond control?

A．Carbon dioxide will pollute the atmosphere.

B．There will not be any forest left in the world.

C．The damage to the environment will be beyond repair.

D．People will have no trees as resources for essential items.