There was a loud noise from outside the window and Jenny's baby was startled and began to cry. Jenny picked up her baby, rocked her back and forth and gently sang a song. In a few moments the baby...

There was a loud noise from outside the window and Jenny's baby was startled and began to cry. Jenny picked up her baby, rocked her back and forth and gently sang a song. In a few moments the baby stopped crying. This is an example of: