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.
【C7】
选项 A、concerns
B、concern
C、concerning
D、concerned
答案B
解析 考查词汇的使用。concern 的相关用法我们都接触过，它首先可以作为动词来使用，比如 "as far as someone is concerned" 这样的表达，此外它也可以表示伴随状态，如 " ... concerning ..."这样的用法；concern 还可以作为名词来使用，表示“受人关注的人或事”。结合上下文，很明显我们需要的就是concern 作为名词的使用，又因为前文出现了冠词a，所以选B。
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