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  3. In 1798 the political economist Malthus predicted that in time mankind would face starvation, having outgrown the available food

In 1798 the political economist Malthus predicted that in time mankind would face starvation, having outgrown the available food

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问题     In 1798 the political economist Malthus predicted that in time mankind would face starvation, having outgrown the available food supplies. Today, a century and a half later, there are still experts who forecast the same global disaster unless urgent measures are taken to prevent it.
    By the end of the present century there may well be over five thousand million people living on this globe, ail increase of over fifty per cent of today’s figure. In order to keep pace with this increase in mankind the farmers of the world would have to step up their production of food by at least two per cent every year. Such a rate of increase has never been maintained in any country by conventional methods of agriculture, despite modern mechanization and the widespread use of fertilizers. There are no large worthwhile reserves of potential farmland, remaining, and good fertile land is continually being diverted to industrial use. Moreover, erosion of the soil takes a constant toll.
    Intensive research, carried out over many years in all manner of climatic conditions, has produced a revolutionary method of growing crops without using any soil at all. Hydroponics, as this technique is called, may well be the answer to all our food worries. Already it has accomplished wonders in producing huge crops. Hydroponics was once a complicated and expensive business; now it is well out of the experimental stage. Labor costs are far lower than when normal methods of agriculture are employed. In fact, it is a completely automatic system. There is no hard manual work, no digging or plowing, and no weeding to speak of. Yields can be far higher than they are in soil.
The phrase "having overgrown the available food supplies" in the first paragraph implies that______.
选项 A、the available food supplies will be enough to feed world population
B、the earth is too exhausted to support its increasing population
C、world population will grow at a rate faster than food production
D、food supplies will be too much available for world population
答案C
解析 这句话在首段里没有解释，因此要在第二段找线索。第二段说人口增长很快，要满足食物供应，就不得不提高现今的食物生产速度，可知答案应为C选项。
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