and understanding the Earth's climate is a very great challenge.

　　31．People usually hold the opinion that________.

　　A.huge dust storms can destroy carbon dioxide

　　B.planting trees could reduce global warming

　　C.huge dust storms can destroy the oceans on the Earth

　　D.planting trees is the only way to control huge dust storms

　　32．Andy，

　　an environmental scientist，

　　believes that________________________________________________________________________.

　　A.environmental problems are more complex than expected

　　B.trees shouldn't have been planted in dry places

　　C.dust plays a more important part than trees

　　D.carbon dioxide is harmful to everything

　　33．Robert's experiment proves that________.

　　A.trees absorb more carbon than grass

　　B.carbon can turn grass into dust

　　C.less carbon can make trees grow faster

　　D.grassland areas should be covered by forests

　　34．The best title for this passage is “________”.

　　A.The importance of planting trees

　　B.The dust clouds soak up carbon dioxide

　　C.Is it really useful to plant trees to reduce global warming？

　　D.Why the soil carbon disappears？

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