lisney

是要加强” the bowerbirds' building styles are a culturally acquired, rather than a genetically transmitted, trait.“这个结论，
D选项我觉得反而有undermine之嫌（即说明building styles是genetically transmitted~因为D选项说local populations of the birds apparently seldom have contact with one another
B选项"Young bird watch old bird building" support结论里”a culturally acquired“