单项选择题

A．They are husband and wife.
B．They are waiter and guest.
C．They are teacher and student.
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单项选择题
Ed learned to play soccer when he was very young. When he was ______, he could play soccer very well.
A．seven
B．eleven
C．fifteen
单项选择题
Besides lights, lighthouses today have ______.
A．fire
B．horns
C．lamps
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