题目内容：

听下面一段独白，回答以下小题。

1.who is Richard?

A. a baby-sitter. B. A researcher. C. A children's writer.

2.With whom do babies feel the most comfortable?

A. Strange adults. B. Baby-sitters. C. Other babies.

3.How do babies react to unfamiliar babies?

A. They reach out. B. They show fear. C. They start to cry.

4.What may the study lead to?

A. Much more parenting time with babies.

B. An increase in family-based day care centers.

C. A greater demand for experienced babysitters.