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.
【C6】

选项 A、earlier
B、past
C、before
D、ago

答案D

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