简答题 简述思维导图（mind mapping）的含义及其两个用途，写出教师在课堂教学中运用思维导图的三点注意事项，并举一例说明思维导图的用法。

A.Babies’cries have long been the concerns of scientists.
B.Babies start their speech acquisition at the age of three months.
C.Studying babies’cries helps us understand their speech perception.
D.Babies’true speech，rather than their cries，should be the focus of study.

A.It begins with the birth of a baby.
B.It begins before the birth of a baby.
C.It begins when a baby starts imitating adults’speech.
D.It begins with a baby’s cry melodies typical of its mother tongue.