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  3. Sea rise as a result of global warming would immediately threaten that large fraction of the globe living at sea level. Nearly o

Sea rise as a result of global warming would immediately threaten that large fraction of the globe living at sea level. Nearly o

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问题     Sea rise as a result of global warming would immediately threaten that large fraction of the globe living at sea level. Nearly one-third of all human beings live within 36 miles of a coastline. Most of the world’s great seaport cities would be【C1】______. Some countries would be inundated. Heavily populated coastal areas【C2】______large populations occupy low-lying areas, would suffer extreme【C3】______.
    Warmer oceans would spawn stronger hurricanes and typhoons, 【C4】______coastal flooding, possibly swamping valuable agricultural lands around the world. 【C5】______water quality may result as【C6】______flooding forces salt water into coastal irrigation and drinking water supplies, and irreplaceable, natural【C7】______could be flooded with ocean water, destroying forever many of the【C8】______plant and animal species living there.
    Food supplies and forests would be【C9】______affected. Changes in rainfall patterns would disrupt agriculture. Warmer temperatures would【C10】______grain-growing regions polewards. The warming would also increase and change the pest plants, such as weeds, and the insects【C11】______the crops.
    Human health would also be affected. Warming could【C12】______tropical climate bringing with it yellow fever and other diseases. The harmful【C13】______of localized urban air pollution would very likely be more serious in warmer【C14】______. There will be some【C15】______from warming. New sea-lanes will open in the Arctic, longer growing seasons further north will【C16】______ new agricultural lands, and warmer temperature will make some of today’s colder regions more【C17】______. But these benefits will be in individual areas. The natural systems—both plant and animal—will be less able than man to cope and【C18】______. Any change of temperature, rainfall, and sea level of the magnitude now【C19】______will be destructive to natural systems and living things and【C20】______to man as well.
【C20】
选项 A、therefore
B、but
C、hence
D、so
答案C
解析 空格前的“温度、降雨等的变化会危害自然系统和生物”和空格后的“人类也将受到危害”存在内在的因果关系，故选hence“因此”。
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