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题目内容
（乐山师范学院翻译）
Already three-quarters of biodiversity in crops has been lost in the last century, according to the United Nations Food and Agriculture Organization.
Eighty percent of maize types that existed in the 1930s are gone, for example. In the United States, 94 percent of peas are no longer grown
Eighty percent of maize types that existed in the 1930s are gone, for example. In the United States, 94 percent of peas are no longer grown
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