6 What do you know about the river Nile?

[Ａ] It's the largest river in the world 

[B] It often flooded in large areas 

[C] It's the second larget river in the world 

7 What did Egyptians build Aswan High Dam? 

[A] In order to sail up stream 

[B] In order to control the flood 

[C] In order to attract visitors