【正确答案】
B
【答案解析】[听力原文] Scientists have discovered the species of songbird performs a tap dance so fast that it can't be seen by the naked eye. Researchers from Japan and Germany slow down footages of the blue capped cordon-bleu songbirds during courtship. Scientists have discovered that tap dance is in the courtship performance of both male and female cordon-bleus. The next step for the researchers is to try and pick whether the birds mate is moved by the sight, the sound or the vibrations of this fancy foot work. Such is the agility of the songbirds show stopping quickstep that could only be fully appreciated in super slow-motion. When does the songbird perform a tap dance? 本题询问鸣禽类什么时候会跳踢踏舞，新闻中提到Scientists have discovered that tap dance is in the courtship performance of both male and female cordon-bleus. 即鸣鸟在求爱期会跳踢踏舞，故答案为B。