题目内容
（请给出正确答案）
A.identify
B.embody
C.substitute
D.picture
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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. _____
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A.swing
B.spread
C.tour
The police fired tear gas into the crowd to () the protesters.
A.distribute
B.disperse
C.spread
D.stretch
A.They infect macro systems as well as micro computers
B.They attach to executable and batch applications
C.They can be transported between different operating systems
D.They spread in distributed systems without detection
A.in
B.to
C.upon
D.on
