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2017托福考试阅读真题全面解析及答案(5)
学科分类:农业类
题目:The Green Revolution
内容回忆:
第1段: The green revolution can date as far back to 1930s. 农业科学家做实验以manipulate the seed of crops to improve productivity. 随后指出科学家把中国大米和印度大米作为 parents研究出IR8,优点是 bigger head of grain and stronger stem。虽然IR8提高了产量,但是科学家仍然不满足,于是研究出了IR36,优点是:来自13个parents(母本),可以抵抗15种pests,110 days of growing period and three crops each year。
第2段:global hunger makes the green revolution extraordinary。India can be self-sufficient in crop production and Asia increases the crop production.
第3段:非洲的地理环境使得其受益较小,故科学家研发出新的super rice,which can be transplanted that depended on seeding directly instead of seedling。
第4段:指出the green revolution 有很多detractors,比如 chemical fertilizers and pesticides can reduce the organic matter in the soil, and many small-scale farmers lack of financial resource to purchase genetical enhanced seeds.
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