TPO11 passage3 第四题

夜小猫猫UID: 3375749

Paragraph 2: Further evidence for the costs of begging comes from a study of differences in the begging calls of warbler species that nest on the ground versus those that nest in the relative safety of trees. The young of ground-nesting warblers produce begging cheeps of higher frequencies than do their tree-nesting relatives. These higher-frequency sounds do not travel as far, and so may better conceal the individuals producing them, who are especially vulnerable to predators in their ground nests. David Haskell created artificial nests with clay eggs and placed them on the ground beside a tape recorder that played the begging calls of either tree-nesting or of ground-nesting warblers. The eggs “advertised” by the tree-nesters' begging calls were found bitten significantly more often than the eggs associated with the ground-nesters' calls.


4. Paragraph 2 indicates that the begging calls of tree nesting warblers
○ put them at more risk than ground-nesting warblers experience
○ can be heard from a greater distance than those of ground-nesting warblers
○ are more likely to conceal the signaler than those of ground-nesting warblers
○ have higher frequencies than those of ground-nesting warblers

答案选的是B，我选的是A，C、D已经知道是明显错误，B和A之间为什么选B 呢？我觉得A也是对的啊。。。求指点

crazyrobinUID: 2368627

A并不能合理的infer出来
你看这句话

and so may better conceal the individuals producing them, who are especially vulnerable to predators in their ground nests

这句话强调的是warbler species in their ground nest are vulnerable and therefore those high-frequency may well serve the purpose of concealing.
但是你并不知道 warbler species in relative safety of trees是否安全。另外为什么用 relative safety 你有考虑过吗？也许作者想说 warbler species在 trees begging本来就安全一些

夜小猫猫UID: 3375749

crazyrobin 发表于 2013-5-10 11:52
A并不能合理的infer出来
你看这句话

喔，我明白了，选项A根据原文其实是不能infer出来的，属于我自己想当然，O(∩_∩)O谢谢啦
首席版主也，好牛呀，嘻嘻，么么