ChaseDream
搜索
返回列表 发新帖
00:00:00

Kate: The recent decline in numbers of the Tennessee warbler, a North American songbird that migrates each fall to coffee plantations in South America, is due to the elimination of the dense tree cover that formerly was a feature of most South American coffee plantations.Scott: The population of the spruce budworm, the warbler's favorite prey in North America, has been dropping. This is a more likely explanation of the warbler's decline.

Which of the following, if true, most seriously calls Scott's hypothesis into question?

正确答案: A

更多相关帖子

524

帖子

15

好友

4712

积分

ChaseDream

注册时间
2003-03-17
精华
8
解析
查看: 1768|回复: 2
打印 上一主题 下一主题

[讨论]GWD-3-38

[复制链接]
楼主
发表于 2005-4-7 00:50:00 | 只看该作者

[讨论]GWD-3-38

Q38:


Kate:  The recent decline in numbers of the Tennessee warbler, a North American songbird that migrates each fall to coffee plantations in South America, is due to the elimination of the dense tree cover that formerly was a feature of most South American coffee plantations.



Scott:  The population of the spruce budworm, the warbler’s favorite prey in North America, has been dropping.  This is a more likely explanation of the warbler’s decline.



Which of the following, if true, most seriously calls Scott’s hypothesis into question?




  • The numbers of the Baltimore oriole, a songbird that dose not eat budworms but is as dependent on South American coffee plantations as is the Tennessee warbler, are declining.

  • The spruce-budworm population has dropped because of a disease that can infect budworms but not Tennessee warblers.

  • The drop in the population of the spruce budworm is expected to be only temporary.

  • Many Tennessee warbler have begun migrating in the fall to places other than traditional coffee plantations.

  • Although many North American songbirds have declined in numbers, no other species has experienced as great a decline as has the Tennessee warbler.
  • 沙发
     楼主| 发表于 2005-4-7 00:51:00 | 只看该作者
    大案为A,选对了。但在复看时觉得B很具迷惑性,请点播,谢谢。
    板凳
    发表于 2005-4-7 02:55:00 | 只看该作者
    Whenever spruce-budworm  population droped, the argument of Scott is supported.
    您需要登录后才可以回帖 登录 | 立即注册

    Mark一下! 看一下! 顶楼主! 感谢分享! 快速回复:

    手机版|ChaseDream|GMT+8, 2024-11-9 09:39
    京公网安备11010202008513号 京ICP证101109号 京ICP备12012021号

    ChaseDream 论坛

    © 2003-2023 ChaseDream.com. All Rights Reserved.

    返回顶部