A rainforest is an area____(cover) by tall trees with the total high rainfall spreading quite equally through the year. Rainforests have a great effect____the world environment because they can take in heat from the sun and adjust the climate. Without the forest cover, these areas would reflect ____(much) heat into the atmosphere, warming the rest of the world. Losing the rainforests may also influence wind and rainfall patterns, potentially____(cause) certain natural disasters all over the world.

    In the past hundred years,____ (human) have begun destroying rainforests in search of the three major resources: land for crops, wood for paper and other products, land for raising farm animals,____affects the environment as a whole. For example, a lot of carbon dioxide in the air comes from burning the rainforests. People   ____(obvious) have a need for the resources from cutting trees ____we will suffer much more than we will benefit.

    Rainforests are often called the world's drug store. More than 25% of the medicines we use today come from plants in rainforests. However, fewer than 1% of rainforest plants have been examined for their____ (medicine) value. It is extremely likely that our best chance to cure diseases ____(lie)somewhere in the world's shrinking rainforests.