i、语言知识及运用 （共两节，满分45分）
第一节：完型填空（共15小题，每小题2分，满分30分）
阅读下面短文，掌握其大意，然后从1—15各题所给的a、b、c和d项中，选出最佳选项，并在答题卡上将该项涂黑。
many of the world's pollution problems have been caused by the crowding of large groups of people into the cities. supply for the needs of the people leads to further 1 by industry.
if the rapid increase of world 2 continues at the present rate, there may be much greater
3 to human beings.
some scientists 4 of the increase in numbers of people as "population pollution''.
about 2,000 years ago, the world population was about 250 million. it 5 a billion in 1850. by 1930 the population was two billion. it is now six billon.
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