段1：①When prehistoric man arrived in new parts of the world, something strange happened to the large animals: they suddenly became extinct. ②Smaller species survived. ③The large, slow-growing animals were easy game, and were quickly hunted to extinction. ④Now something similar could be happening in the oceans.
31.The extinction of large prehistoric animals is noted to suggest that
[A] large animals were vulnerable to the changing environment.
[B] small species survived as large animals disappeared.
[C] large sea animals may face the same threat today.
[D] slow-growing fish outlive fast-growing ones.
答案：C
问：第31题B选项的错误原因包括下列哪些？（多选题）
A : 选项中的small species（小型物种）不能等同于原文中的Smaller species（较小型的物种）
B : 原文并未提及small species survived与large animals disappeared这两件事之间有任何逻辑关系
C : 原文虽然提到“大型动物灭绝，小型动物幸存”，但这并非文章提及史前大型动物灭绝的目的
D : 原文并未提及large animals disappeared这一事件
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