Questions 8 to 10 are based on the following conversation. At the end of the conversation, you will be given 15 seconds to answer the questions. Now listen to the conversation.

What is NOT mentioned when Maggie is talking about her experience in Ocean .Park

A．before the Egyptians developed a sophisticated technology
B．after the Egyptians developed a sophisticated technology
C．to house the tombs of all ancient Egyptian kings and nobles
D．to keep mummies safe forever

A．To keep out boats that are too large for the canal.
B．To measure the tonnage of canal boats.
C．To load and unload the cargo.
D．To change the depth of the water.