South AmericaLocated mostly(most) in the southern half of the earth, South America is a very（41）_____(interest) continent. The northern part of the continent is（42）_____(cover). By the Amazon Rainforest, which is home to thousands of the plant animal species. It is a very important force（43）_____(shape) the world's weather and climate patterns. And it is also important for the（44）_____(develop) of the economy of South America. Products such as chocolate, rubber, coffee and many kinds of medicine are（45）_____(harvest) from the plants found in the rainforest. Even the liquid from the skin of some species of tree frogs are being used as（46）_____(experiment) medicines. Other parts of South America are very（47）_____(differ).The Andes Mountains spread over the（48）_____(west) part of South America. The ranges, about 5500 miles long, are a continuous barrier, with many peaks rising beyond 2000（49）_____(foot). Southern South America is an extremely（50）_____(wind) and cold place where many species of penguins（企鹅）, seals and whales live._____