The central plains of China have been farmed continuously for thousands of years and you begin to wonder how they have stayed __________. ( 章节：1 难度：1)_做题室

单项选择题The central plains of China have been farmed continuously for thousands of years and you begin to wonder how they have stayed __________. ( 章节：1 难度：1): A、formal; B、fertile; C、incredible; D、initial

正确答案：B
答案解析：
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