[解析]
(1)A.考查细节题.根据第一段最后一句"This isn't a cure,though,say experts,as thirsty trees can make the problem worse by taking in groundwater. "第二段第二句"We need to calculate how much water the trees will absorb,or else it could have a negative effect."树会汲取地下水.故答案选A.
(2)C.考查细节题.根据第五段第二、三句"The next day,he was back,shaking his head at the plan.The idea of uprooting his family troubles him,as does the idea of giving up the land that fed his forefathers."第二天他回来了,他不同意这个计划.搬家的想法让他很烦恼,因为放弃养育了祖祖辈辈的土地的想法让他很烦恼.选C.
(3)C.考查推理判断题.根据第六段"With enough water,this problem can be solved," Lu says. "We can plant trees and grass,and they will grow bigger.That will stop the desert."如果有水,这个问题就迎刃而解,我们就可以种草和树,他们就可以种庄稼.这就可以阻止沙漠推进.最后一段"Roadside signs urge farmers to "Save Water,Protect the Environment"."选C.
(4)D.考查细节题.根据最后一段"Experts say that farmers could switch to drip irrigation (滴灌)to lessen their water intake for growing crops"专家建议农民改用滴灌的方法减少农业的用水量.选D.