任务一: 句子背诵(Water)
63. Humans need access to clean, safe drinking water in order to live, and poor water quality is a major cause of disease and death. Drinking water is contaminated by sewage or waste water in some developing countries, where there is often a lack of the means to treat and supply water to citizens, while developed countries tend to have much better sanitation and citizens have access to clean tap water.
人类需要干净，安全的饮用水才能生存，水质问题是导致疾病和死亡的一个主因。在一些发展中国家，饮用水被污水和废水污染，而发展中国家又恰好缺乏水处理和水供应的方法。发达国家有更好的卫生状况，人们可以使用干净的自来水。
64. The supply of water is also an important political issue. Huge amount of water is needed for agriculture and industry, and as populations grow, there is more pressure on water supplies.
水的供应同时也是一个重要的政治问题。农业和工业需要大量的水，同时随着人口的增加，水供应的压力会更大。
65. If water is free, people take it for granted. They leave taps running while washing or brushing their teeth. If we have to pay for water, we will use it more responsibly, and governments can invest more money in maintaining and improving water supply systems, which are extremely expensive
如果水是免费的，人们就不会珍惜。在洗东西或刷牙时不关水龙头。如果付费，我们会更加合理的使用水。政府也可以有钱投入在维护和提升非常昂贵的供水系统。
66.Many people carry bottles of water wherever they go (to work or to the gym), but we should consume less bottled water because plastic water bottles add to litter and waste problems.
很多人去哪里都带瓶装水(比如工作或健身房)，但是我们应该尽可能少的消费瓶装水因为塑料瓶会加重垃圾和废物问题。