A、[A] challenges the viewpoint in the lst paragraph.
B、[B] modifies his view expressed in the lst paragraph.
C、[C] provides the reason for the argument in the lst paragraph.
D、[D] further analyzes the issue discussed in the lst paragraph.
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试题解析
50．A【精析】该题为推理题。根据第二段第一句“Granting all this，the fact remains that the trans-Atlantic slave trade conducted by the Eu- ropeans was entirely different in quantity and quality from the tradi- tional type of slavery that had existed within Africa.”可知，作者表示虽然第一段认为非洲本地的奴隶制度与欧洲的奴隶制度本质上是一致的，但是欧洲组织的奴隶贸易在数量上和质量上都完全不同于非洲传统的奴隶制度，接下来作者主要讲述了欧洲奴隶制度的特点。因此，第二段对第一段观点提出了质疑，故选择A项。
