回复：我的第一篇论文！竟然是A-！
看了一下，逻辑和事例都不错，不过作为大学阶段的文章语言上还需要努力。
比如开篇的：The Atlantic slave trade, which was occurred ...
一般不会用 was occurred，occur这个词本身就是被动语态，所以应该是The Atlantic slave trade, which occurred...
比如：This led to the price much lower than the Amerindians and whites directly.
感觉比较正常一点的语序应该是 This led directly to a much lower price for the Africans than for the Amerindians and the whites. 因为一般lead to的是一个fact，即 lower price。
深灰街道，月白城堡，银色树梢，都在闪耀
围脖戳这里：http://weibo.com/shellingford
