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.
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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.
单项选择题
A．Company and customer.B．Repairman and customer.C．Teacher and student’s parent.D．Wife and husband,
A．Company and customer.
B．Repairman and customer.
C．Teacher and student’s parent.
D．Wife and husband,
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