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 medical value . It is extremely likely that our best chance to cure diseases lies somewhere in the world's shrinking rainforests.

　　Rainforests can help to adjust the climate because they

　　.

　　Reflect more heat into the atmosphere

　　Reduce the effect of heat from the sun on the earth

　　Bring about high rainfall throughout the world

　　Rarely cause the temperature to drop lower than 16?C

　　What does the word “this” underlined in the third paragraph refer to?

　　Humans have begun destroying rainforests.

　　People have a strong desire for resources.

　　We will lose much more than we can gain.

　　Much carbon dioxide comes from burning rainforests

　　It can be inferred from the text that

　　.

　　We can get enough resources without rainforests

　　We will grow fewer kinds of crops in the gained land

　　The level of annual rainfall affects wind patterns

　　There is great medicine potential in rainforests

　　What might be the best title for the text?

　　Rainforests and the environment

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