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【单选题】
关于非洲的农业,下列说法错误的是A.
在 7000 年前撒哈拉干涸成沙漠以前，这里曾放牧着成群的绵羊、山羊和牛
B.
农业大约在公元前 6500 年前后出现在埃及
C.
热带大草原地区培育的水稻被认为是当地的
D.
埃塞俄比亚培育的大多数作物是从外部引进的
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