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All the recorded staple crops grown in western Africa were introduced from elsewhere, beginning, at some unknown date, with rice and yams.
但我觉得A也不不是很严谨啊
上面这句说了:
All the recorded staple crops grown in western Africa were introduced from elsewhere, beginning with rice and yams.
A不是只是重复了一下已经给出的信息吗?原文中已经说了所有的staple crops来自非洲以外,最先传入的是rice and yams.那么,在rice and yams之前怎么可能有其它staple crops,更别说什么停止种植了。
请NN们讲解,谢谢! |