What does the professor compare to a housefly laying many eggs？

A．A child learning many different ideas from his or her parents

B．Alligators reproducing in New York sewers

C．Different people remembering different versions of a story

D．A person singing the "Twinkle, twinkle" song many times

此题为多项选择题。请帮忙给出正确答案和分析，谢谢！