OG12-21

778879

         Male bowerbirds construct elaborately decorated
nests, or bowers. Basing their judgment on the fact
that different local populations of bowerbirds of the
same species build bowers that exhibit different
building and decorative styles, researchers have
concluded that the bowerbirds' building styles are
a culturally acquired, rather than a genetically
transmitted, trait.

Which of the following, if true, would most strengthen
the conclusion drawn by the researchers?

(A)There are more common characteristics than
there are differences among the bower-building
styles of the local bowerbird population that has
been studied most extensively.

(B)Young male bowerbirds are inept at bower-
building and apparently spend years watching
their elders before becoming accomplished in
the local bower style.

(C)The bowers of one species of bowerbird lack the
towers and ornamentation characteristic of the
bowers of most other species of bowerbird.

(D)Bowerbirds are found only in New Guinea and
Australia, where local populations of the birds
apparently seldom have contact with one
another.

(E)It is well known that the song dialects of some
songbirds are learned rather than transmitted
genetically.

我不太明白A选项是什么意思。。望解答。。。