题目内容

It is not a must for the developing countries that currently lack adequate capital to __________ this wasteful practice.

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They need toilets which can safely turn human waste into a smellless, soil-like ________.

However, almost 60 percent of the water is lost during the ________.

Much greater use could also be made of recycled ________.

_________________,it is at the political level that determines whether the battle to fight against the global water problems will ultimately be won or lost.