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  3. Air pollution killed about seven million people last year, making it the world’s single biggest environmental health risk, the W

Air pollution killed about seven million people last year, making it the world’s single biggest environmental health risk, the W

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问题     Air pollution killed about seven million people last year, making it the world’s single biggest environmental health risk, the World Health Organisation (WHO) says. The【C1】________a doubling of previous estimates, means one in eight of all global deaths were linked to polluted air. This means air pollution has【C2】________poor diet, high blood pressure and tobacco smoke as the leading【C3】________of preventable death worldwide. It also shows how【C4】________pollution inside and outside of people’s homes could save millions of lives in future.
    Air pollution deaths are most【C5】________from heart disease, strokes or lung disease. It is also linked to deaths from lung cancer and【C6】________breathing infections. "The evidence【C7】________the need for concerted action to clean up the air we all breathe," said Maria Neira, an official from WHO. "The risks from air pollution are now far greater than previously thought or understood, particularly for heart disease and strokes."
    Poor and middleincome countries in Southeast Asia and the Western Pacific region had the largest number of air pollution-related deaths, with 3.3 million deaths linked to indoor air pollution and 2.6 million deaths to outdoor air pollution. Indoor pollution is mostly caused by cooking【C8】________coal, wood stoves. The WHO estimates that around 2.9 billion people worldwide live in homes using wood or coal as their【C9】________cooking fuel. Outdoors, air is mainly polluted by transport, power generation, industrial and agricultural emissions and residential【C10】________and cooking. Research suggests outdoor air pollution【C11】________levels have risen significantly in some parts of the world, particularly in【C12】________ countries with large populations【C13】________rapid industrialization.
    Carlos Dora, a WHO public health expert, called on governments and health【C14】________to act on the evidence and【C15】________policies to reduce air pollution, which【C16】________would improve health and reduce humans’【C17】________on climate change. "Excessive air pollution is often a by-product of unsustainable policies in【C18】________such as transport, energy, waste management and industry, " he said. "In most cases, healthier【C19】________will also be more economical in the long term due to healthcare cost savings as well as climate【C20】________."
【C11】
选项 A、standard
B、exposure
C、control
D、legislation
答案B
解析 本句承接上句，对室外污染作进一步阐述。Air pollution exposure意为“暴露于空气污染中”，强调的是人作为主体暴露于其中，暴露水平越高，污染就越严重。A项standard、C项control、D项和air pollution…level搭配后分别表示 “空气污染标准水平”、“空气污染控制水平”、“空气污染立法水平”，均不能体现本句主语Research的内容，也与本文讨论主题无关。
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