1 . 听下面一段独白，回答以下小题。
1. How is the newly printed house different from previous ones?

A．It was printed in pieces.

B．It was made from waste materials.

C．The whole thing was printed at once.

2. How much does the printed 400-square-foot house cost in California?

A．$ 5,000.

B．$10,000.

C．$15,000.

3. Where were ten houses printed in just 24 hours?

A．In China.

B．In Russia.

C．In the United States.

4. How do engineers think the new technology could be used?

A．To put buildings on Mars.

B．To recycle old materials.

C．To construct buildings on the moon.