题目内容
This is the total number of people who suffer from various diseases that the World Health Organization ________________unsafe drinking supplies.
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United Nations officials had expected that these avoidable deaths would become the focus of the world’s news agencies through the report of the 3rd World Water ______.
______________ solutions such as solar-powered desalination plants are very useful.
In the rich North, toilets using water are the largest single__________ on domestic water supplies.
It is not a must for the developing countries that currently lack adequate capital to __________ this wasteful practice.
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