题目内容
（请给出正确答案）
[单选题]
Nations should treat each other in a fair way, regardless of the ____________ in their political systems or stages of economic development.
A.problem
B.level
C.disparity
D.standard
提问人：网友ymwang110
发布时间：2022-01-07
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【B3】______ our bodies require water to treat waste products, plentiful water is required for proper sanitation (卫生) —water that for much of mankind is simply not available. 【B4】______ people without adequate sanitation rose from 2.6 billion in 1990 to 2.9 billion in 1999, And sanitation is literally a matter of life and death. In a 【B5】______ statement, United Nations officials warned: "When children lack water that is fit for drinking and sanitation, virtually every aspect of their health and development is 【B6】______ ."
Food production is dependent on water. Many crops, of course, are watered by rain, but in recent times irrigation has become the key 【B7】______ the world's booming population. Today 36 percent of the world's harvest depends on irrigation.
If plentiful water flows out of every tap in our home and if we have a clean toilet (抽水) that conveniently washes out waste, it may be 【B8】______ to believe that the world is running out of an adequate supply of water. We should remember, however, that only 20 percent of mankind enjoy such 【B9】______ . In Africa many women spend as much as six hours a day 【B10】______ water.
【B1】
A．hurts
B．harms
C．injures
D．destroys
