听下面一段独白，回答以下小题。

【小题1】What do people do on Arbor Day in the United States?

A．They plant trees.

B．They do sports.

C．They do shopping.

【小题2】What was the program adopted for?

A．To stop pollution.

B．To improve people’s idea.

C．To improve the landscape.

【小题3】Who did Mr. Morton plant trees with?

A．His children.

B．His friends.

C．His wife.

【小题4】What were planted to be windbreaks in the dusty star k terrain?

A．Much grass.

B．Many trees.

C．Both A and B.