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  3. Many of the world’s pollution problems have been caused by the crowding of large groups of people into the cities. To supply for

Many of the world’s pollution problems have been caused by the crowding of large groups of people into the cities. To supply for

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问题     Many of the world’s pollution problems have been caused by the crowding of large groups of people into the cities. To supply for the needs of the people【C1】______further pollution by industry.【C2】______the rapid increase in human pollution continues【C3】______the present rate, there may be【C4】______greater harm. Some scientists speak of the increase in the number of people【C5】______"population pollution" .
    About 2,000 years【C6】______, the world population was probably about 250 million. It【C7】______about one billion in 1850. By 1930 the population was about two billion. It is【C8】______over seven billion. And it is【C9】______to be over 9 billion by the year 2050. If the population continues to grow at【C10】______same rate, there would be twenty-five billion people in the world a hundred years【C11】______now!
    Man has been【C12】______the earth’ s resources more and more rapidly over the years. Some of them are almost gone. Now many people believe that man’ s greatest problem is【C13】______to control the【C14】______of his own population. The materials in the world will not support the human【C15】______, in times to come, if the present rate of increase【C16】______. Already there is overcrowding in the cities and【C17】______in some countries. Can man’ s increase rate【C18】______? Many people believe【C19】______human survival in the future【C20】______on the answer to this question.
【C18】
选项 A、raise
B、continue
C、over
D、up
答案B
解析 逻辑推理题。根据上下文可知，此处表达的是“人口的增长速度会继续下去吗?”因此应选continue，意为“继续”。
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