问题详情

Why does the author mention a bell and a rattle in lines 4-5 ？
A．To contrast the reactions of babies to human and nonhuman sounds
B．To give examples of sounds that will cause a baby to cry
C．To explain how babies distinguish between different nonhuman sounds
D．To give examples of typical toys that babies do not like请帮忙给出正确答案和分析，谢谢！