The most【B1】______problem created by the rapid increase in population is a【B2】______of food. More mouths have to be【B3】______eve

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问题     The most【B1】______problem created by the rapid increase in population is a【B2】______of food. More mouths have to be【B3】______every year, and yet a high【B4】______of the existing population are not getting enough of the right kind of food. Over the past two years the total amount of food has【B5】______, and of【B6】______the total【B7】______of food per person has decreased even more【B8】______
    【B9】______. The adults have to work harder than ever to provide for the needs of the children, who cannot contribute to the economy until they are older.【B10】______. Farming land is becoming scarce, so country people are moving to the towns and cities in the hope of finding a better standard of living. 【B11】______. Finally, there are too few jobs and unemployment leads to further poverty.
【B5】

选项

答案decreased

解析 空前的has表明此处应填一过去分词。根据逻,下文提到人均粮食减少,自然在过去两年里,粮食总产量减少了(decreased)。
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