最新提问
我的动态
登录后查看动态
题目内容双击单词支持查询和收藏哦～
题目材料：
Important historical differences between Europe and North America may explain why many European migratory songbirds, in contrast to North American migratory songbirds, thrive in forest habitats fragmented by human activity. First,the Pleistocene glaciations may have been more severe in Europe than in North America. Virtually all Europe's forests were erased during the most recent Ice Age. Any European songbirds dependent upon large,intact blocks of forest were unlikely to survive. In the southern part of North America, however some forests managed to persist through the coldest times, to the advantage of some forest-dwelling songbirds. Second, European forests were being abused by humans for thousands of years before the North American forests were. Consequently, European birds have had more time to adapt to a human-dominated landscape.
· 相关考点
句子功能
句子功能
以上解析由 考满分老师提供。
