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刷刷题刷刷变学霸
举一反三
【单选题】Passage One Desertification (沙漠化) in the dry United States is very serious. Groundwater supplies beneath vast stretches of land are dropping rapidly. Many river systems have dried up. Hu...
A.
both the world and America need the land for agricultural aims
B.
they bring about a large amount of waste of resources
C.
Americans do not need that many shopping centers and apartments
D.
industrial parks and waste dumps are seriously polluting the environment
【单选题】Desertification (沙漠化) in the dry United States is very serious. Groundwater supplies beneath vast stretches of land are dropping rapidly. Many river systems have dried up. Hundreds of thousands of acr...
A.
The shrinking of forest coverage.
B.
The lack of water supplies.
C.
A quickly decreasing production of crops.
D.
A large area of cropland changed into grassland.