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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 middle-income 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】______."
【C5】
选项 A、commonly
B、directly
C、incidentally
D、rarely
答案A
解析 本段最后一句提到空气污染的危险比之前所想象的和所了解的要大得多。特别是对心脏病和中风患者而言，说明这些患者受到空气污染的危害并因此死亡最为常见。A项commonly意为“通常地”，符合此处的语境。
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