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  3. Thomas Malthus published his Essay on the Principle of Population almost 200 years ago. Ever since then, forecasters have being

Thomas Malthus published his Essay on the Principle of Population almost 200 years ago. Ever since then, forecasters have being

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问题     Thomas Malthus published his Essay on the Principle of Population almost 200 years
ago. Ever since then, forecasters have being warning that worldwide famine was just around
the next comer. The fast-growing population’s demand for food, they warned, would soon
exceed their supply,   leading to widespread food shortages and starvation.
    But in reality,   the world’s total grain harvest has risen steadily over the years. Except
for relative isolated trouble spots like present-day Somalia, and occasional years of poor
harvests, the world food crisis has remained just around the corner. Most experts believe
this can continue even as if the population doubles by the mid-21st century, although feeding
10 billion people will not be easy for politics, economic and environmental reasons. Optimists
point to concrete examples of continued improvements in yield. In Africa, by instance,
improved seeds, more fertilizers and advanced growing practices have more than double
corn and wheat yields in an experiment. Elsewhere, rice experts in the Philippines are
producing a plant with few stems and more seeds. There is no guarantee that plant breeders
can continue to develop new, higher-yielding crop, but most researchers see their success
to date as reason for hope.

【M7】
选项
答案第10行的by→for。
解析 该句的意思是“例如，在非洲，在一项试验中，改良种子、更多化肥和先进的种植方法使玉米和小麦产量增加了一倍以上”。for instance为固定用法，表示“例如”。因此将by改为for。
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本试题收录于： B类竞赛（英语专业本科专科）题库大学生英语竞赛（NECCS）分类
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B类竞赛（英语专业本科专科）

大学生英语竞赛（NECCS）

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