1 . 听下面一段独白，回答以下小题。
1. What is the main topic discussed in the passage?

A．The development of science and industry in America.

B．The influence (影响) of science and industry on American families.

C．The harmful effect of industrialization.

2. What are described in the passage?

A．Families of the present and of the future.

B．Families of the past and of the future.

C．Families of the past, the present and the future.

3. Who will be in charge of raising children in the future?

A．All families.

B．Social workers.

C．A small number of families.

4. What can we conclude from the passage?

A．Large families can hardly exist in modern society.

B．Children do not like to live with their parents or grandparents.

C．Americans are very careful in choosing their jobs.