2. 外语
  3. Water is tasteless, odorless, and nearly colorless (it has a slight hint of blue). It is a【C1】______ that is essential to all kn

Water is tasteless, odorless, and nearly colorless (it has a slight hint of blue). It is a【C1】______ that is essential to all kn

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问题     Water is tasteless, odorless, and nearly colorless (it has a slight hint of blue). It is a【C1】______ that is essential to all known forms of life in its pure form. Water is【C2】______ on Earth. It exists in many places and forms. It appears mostly in the oceans and polar ice caps, but also【C3】______ clouds, rain water, rivers, freshwater aquifers, and sea ice. On the planet, water is【C4】______ moving through the cycle involving evaporation, precipitation, and runoff to the sea.
    Water fit for human【C5】______ is called potable water. This natural resource is becoming【C6】______ in certain places as human population in those places increases, and its availability is a major social and economic【C7】______ .
    Drinking water is water that is intended to be drunk by humans. Water of【C8】______ quality to serve as drinking water is called potable water whether it is used as such or not. Although most fresh water sources are drinkable【C9】______ humans, they can be a disease vector or cause long-term health problems if they do not【C10】______ certain water quality guidelines.
    Most nations have water quality regulations for water sold as drinking water, although these are often not strictly【C11】______ outside of the developed world. Virtually all municipal water systems deliver a single quality of water, whether it is to be used for drinking, washing or landscape irrigation.
    In the United States, public drinking water is【C12】______ by the Safe Drinking Water Act (SDWA). Among other【C13】______ , it protects the right of employees to report potential【C14】______ . Within 30 days of any retaliation, a whistleblower can file a complaint with the Occupational Safety and Health Administration (OSHA).
    So far【C15】______ bacterial is concerned, the usual test is for a count of (more often than not harmless) bacteria, it【C16】______ that these serve as an indication of water pollution.
    Water purification is the removal of contaminants from【C17】______ water to produce drinking water that is pure enough for humans. Many contaminants can be dangerous —but【C18】______ the quality standards, others are removed to improve the water’s smell,【C19】______ , and appearance.
    It is not possible to tell whether water is safe to drink just by looking at it. Simple procedures such as boiling are not sufficient for treating water from an unknown source. Even natural spring water —【C20】______ safe for all practical purposes in the 1800’s —must now be tested before determining what kind of treatment is needed.
【C18】
选项 A、depends on
B、depends
C、depending on
D、independent from
答案C
解析 首先判断句义，“______ (不同的)质量标准，其他的一些物质被从水里去除出去”，需要填入的是具有“根据，依据”意思的词，选择to depend on 这样的结构，淘汰B和D；然后根据句子的结构分析，but 后面跟着的是两个句子，我们通过动词ing 的方式使前面一句失去独立性，选择C。
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