※ 引述《Diablotin (咕嚕咕嚕)》之銘言：
: 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
: (A) put them at more risk than ground-nesting warblers experience
: (B) can be heard from a greater distance than those of ground-nesting
: warblers
: (C) are more likely to conceal the signaler than those of ground-nesting
: warblers
: (D) have higher frequencies than those of ground nesting warblers
: 答案B
: 想請問A為什麼不對呢？我是看了這段的最後一句選的, 還是(A)說把他們warbler自己
: 放在危險的情況不對 應該是把egg放在危險的情況
我想這題的重點應該是 the higher-frequency
因為在築巢在地上的warblers所發出的乞食叫聲的頻率比較高沒有辦法傳太遠
這使得掠食者必須靠的更近才會發現他們
而最後一句實驗的情況是把兩種頻率不同的錄音放在同樣的鳥巢
都是放在假扮的鳥蛋裡
這表示他們暴露在同樣的危險之下
但是發出 築巢在樹上warblers的乞食聲 的假蛋受到的攻擊比率比較高
我想應該是這樣吧...
唉 我剛好也做到這題....頭好大
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