Limited agricultural productivity, continued land degradation and water_________have made food self-sufficiency goals unachievab

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问题 Limited agricultural productivity, continued land degradation and water_________have made food self-sufficiency goals unachievable.

选项 A、scarcity
B、variety
C、rarity
D、validity

答案A

解析 句意:有限的农业生产力、持续的土地退化和水资源匮乏,使得食物自给自足的计划变得难以实现。scarcity(缺乏,不足);variety(多样性,变化);rarity(稀有);validity(有效性,合法性)。所以选项A为答案。
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