Read the statement or passage then choose the best answer too the questions. Answer the question based on what is stated or implied in the statement or passage. The Amazon Rainforest is one of the most important ecosystems in the world. However, it is slowly being destroyed. Areas of the rainforest are being cleared for farms and roads, and much of the wood is also being harvested and sold. There are several compelling reasons to protect this area. First, a significant number of pharmaceuticals are made from plants that have been discovered in the rainforest, and it's quite possible there are still important plants that have not yet been discovered. Secondly, the rainforest provides a significant portion of the world's oxygen and also absorbs great amounts of carbon dioxide. Without rainforests, global warming could accelerate.

The main purpose of the passage is
1.to present the major reasons why the Amazon Rainforest is being destroyed
2.to discuss how the rainforest helped in the development of medications
3.to explain why the Amazon Rainforest should be protect
4.to argue that rainforest destruction is a major cause of global warming