托福听力official54 Paragraph 7 suggests that Donald Grayson believes which of the following about the remains at Clovis sites and megafaunal extinctions? 答案解析

题目问第7段表明Donald Grayson相信以下哪一个关于Clovis遗址的遗骸和巨型动物灭绝？定位到“As archaeologist Donald Grayson points out, in other cases where extinction resulted from the quick spread of human hunters—for example, the extinction of the moa, the large flightless bird of New Zealand—archaeological evidence in the form of remains is abundant. Grayson has also shown that the evidence is not so clear that all or even most of the large herbivores in late Pleistocene America became extinct after the appearance of Clovis.”前面说其他的证据都由考古形式遗骸得到证明，而对于遗址和巨型动物灭绝的证据却很模糊。 A选项：人类的快速传播解释了为什么灭绝也以很快的速度发生。原文并未提及两者关系。 B选项：鉴于灭绝发生的速度，缺乏人类导致灭绝的迹象并不令人意外。原文没有关于Donald对此做出“并不令人意外”的表示。 C选项：随着测定方法的改进，可能会发现更多证据。原文并没有关于对测定方法的论述，错误。 D选项：人类如果确实对它们造成了灭绝，现在已经发现了更多的证据。这句话就是定位的句子的隐藏意义，故选D。