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
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