South America

Located 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.