题目内容

收藏纠错

题目材料：

Human impacts on the natural environment during the later part of the Holocene (beginning about 4,000 years ago) complicate investigations into environmental change during that period because the signals produced by human-and climate-induced change are sometimes difficult to separate. For example, in the later Holocene, one indicator of increased aridity due to climate change is an increase in pollen from grasses, as forest vegetation gives way to grassland. Such a change in vegetation could alternatively be attributed to human impact in the form of agricultural development. Examples of such human impact from 4,000 years ago would be small-scale, however, since the broad ecosystem changes brought about by the widespread adoption of agricultural technologies occurred later.

In the context of the passage the highlighted sentence serves to

Aexplain the broader rationale for a conclusion described in the preceding sentence
Bsuggest some of the drawbacks of the riverbank location of the villages described in the following sentence
Cacknowledge information that appears to undermine a description attributed to Orellana
Dintroduce a principle that appears to be contradicted by the agricultural development of premodern Amazonia
Egive a reason for an upward revision in earlier estimates for premodern Amazonia

A显示答案

登录后才可以添加做题笔记哦，还没有账号？马上注册

以上解析由考满分老师提供。

题目讨论

已经输入 0 个字标记为提问，会有更多小伙伴帮你解答提交

全部讨论

只看提问

按时间排序

按点赞数排序

拓展练习

练习记录

最新提问

题目内容

题目讨论