1 . 听下面一段独白，回答以下小题。
1. What did Spanish merchants take to the Americans?

A．Corn.

B．Wheat.

C．Potatoes.

2. Why did Balboa feel surprised?

A．He saw the Pacific Ocean.

B．There were many jungles.

C．Panama was so narrow.

3. When did Francisco Pizarro leave for the Inca Empire?

A．In 1513.

B．In 1524.

C．In 1533.

4. What was the Inca Empire rich in?

A．Wildlife.

B．Rocks.

C．Gold and silver.