Complete the summary below.Choose ONE WORD ONLY from the passage for each answe

游客2025-02-16 20

问题 Complete the summary below.
Choose ONE WORD ONLY from the passage for each answer.
Write your answers in boxes 20-25 on your answer sheet.
Space for an increased population
According to the writer, the use of land for 【R20】______is the most serious threat to the environment. However, in the US, there has already been an increase in the amount of land used for 【R21】______and forests. Far less land would be required to feed the world’s population if the 【R22】______of the land could be improved worldwide. It has also been claimed that the industrial production of animal foods could allow greater access to animal 【R23】______by the entire world’s population. Scientists could use 【R24】______from domesticated animals to help produce meat by tissue cloning, and these species could then be allowed to die out. In addition to this type of meat, 【R25】______will also be widely available. [br] 【R22】

选项

答案 productivity

解析 Paragraph 5: Taking the best Iowa maize growers as the norm for world food productivity, it has been calculated that less than a tenth of present cropland could support a population of 10 billion.

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