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.
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单项选择题
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.
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．4 years.B．5 years.C．8 years.D．At least 9 years.
A．4 years.
B．5 years.
C．8 years.
D．At least 9 years.
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