单项选择题

A．Because it’s the holiday season.
B．Because the tickets are sold at a discount.
C．Because only one or two flights arc available each day.
D．Because the other flights have been cancelled.
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单项选择题
A．He didn’t understand the lecture.B．He wants to borrow her notes next week.C．He needs help with a makeup exam.D．He was sick and unable to attend.
A．He didn’t understand the lecture.
B．He wants to borrow her notes next week.
C．He needs help with a makeup exam.
D．He was sick and unable to attend.
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 army attack.
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 army attack.
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