1 . 听下面一段独白，回答以下小题。
1. When was World Environment Day established?

A．In 1972.

B．In 1974.

C．In 1987.

2. Where were the first international celebrations of World Environment Day held?

A．In England.

B．In the United States.

C．In Kenya.

3. What was the first theme of World Environment Day?

A．One Earth One Family.

B．Only One Earth.

C．For Life on Earth.

4. What can we learn about World Environment Day?

A．It is celebrated each year on July 5.

B．Tree planting is the main activity.

C．International environmental conventions are signed during it.