2. 外语
  3. Pollution of water supplies is usually due to poor health conditions close to water sources, sewage 【T1】______into the sources t

Pollution of water supplies is usually due to poor health conditions close to water sources, sewage 【T1】______into the sources t

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问题    Pollution of water supplies is usually due to poor health conditions close to water sources, sewage 【T1】______into the sources themselves, leakage of sewage into 【T2】______ systems or pollution with industrial or 【T3】______waste. Even if a piped water supply is safe at its source, it is not always safe by the time it reaches the tap. Intermittent tap water supplies should be 【T4】______as particularly suspect.
   Travelers on short trips to areas with water supplies of uncertain 【T5】______should avoid drinking tap water, or 【T6】______water from any other source. It is best to drink hot drinks, bottled or canned drinks of well-known brand names—international 【T7】______ of water treatment are usually followed at bottling plants. Carbonated (含二氧化碳的) drinks are acidic (酸性的), and slightly safer. 【T8】______, and that their rims (边缘) are clean and dry.
   Boiling is always a good way of treating water. 【T9】______. Portable boiling elements that can boil small quantities of water are useful when the right voltage (电压) of electricity is available. 【T10】______.
【T3】
选项
答案agricultural
解析 根据空格前面的or可知此处需要填入一个形容词与industrial并列。结合常识可知，与工业并列且最有可能造成水污染的应该是农业或商业。结合录音可知答案为agricultural，意为“农业的”。
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