单项选择题

Passage Two
Questions 29 to 31 are based on the passage you have just heard.

A．4 years.
B．5 years.
C．8 years.
D．At least 9 years.
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单项选择题
A．Guarding the coasts of the United StatesB．Being part of the United States Navy.C．Guiding people along the coast.D．Protecting people from enemy attacks.
A．Guarding the coasts of the United States
B．Being part of the United States Navy.
C．Guiding people along the coast.
D．Protecting people from enemy attacks.
单项选择题
A．A famous photographer.B．Photographic processes in the 1800s.C．Photographic equipment used in the 1800s.D．A new museum.
A．A famous photographer.
B．Photographic processes in the 1800s.
C．Photographic equipment used in the 1800s.
D．A new museum.
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