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Tropical rainforests are located in tropical regions(热带地区) near the equator(赤道). They are big forests and get _____ rainfall. They’re very important in many ways.

Jewel of the earth

We call tropical rainforests the “jewel of the earth” because they are home to 2/3 of all the living animals and plants on the planet. It’s estimated(估计) that millions of new species(种类) of plants and animals are _____ undiscovered here.

World’s largest drug store

Tropical rainforests are also considered the “world’s largest drug store” because lots of natural medicines can be found there. We use these plants and animals to make drugs for certain diseases. One in four drugs comes from a plant in the tropical rainforests. _____, 1400 rainforest plants are believed to offer cures(药) for cancer.

Earth’s drugs

The Amazon Rainforest(亚马逊雨林) has been called the “lungs of our planet” because it provides an environment for _____ to turn carbon dioxide(二氧化碳) into oxygen(氧气). It’s said that more than 20% of the world’s oxygen is produced in the the Amazon Rainforest.

Tropical rainforests are one of nature’s treasure(珍宝), _____ many of them are now in danger. Tropical rainforests are being destroyed. In just a few decades, the world’s rainforests may disappear(消失) _____!