Which of the following is NOT mentioned as a cause of the problem discussed in the
A. Natural barriers to sea water have been destroyed.
B. the water table has gone down after droughts.
C. Sea level has been continuously rising.
D. Evaporation of water leaves salt behind
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根据下列材料请回答 86~90 题:
第 86 题 2007年我国全年水资源总量为:
检验和衡量教育工作好坏,主要看,()是否得以实现。
根据下列材料回答第 67~70 题:
第 67 题 唐某的诉讼请求中有拆机终止电话服务合同,退还初装费2000元的要求。电信局以上级主管部门有文件规定为由,只同意退还70%,对此应如何判断?()