单项选择题

A．The disadvantages of working in an office.
B．The waste produced in an office.
C．To save resources when working in an office.
D．How to save water in a restroom.
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单项选择题
A．A bank clerk and customer.B．Waiter and diner.C．Professor and student.D．Manger and secretary.
A．A bank clerk and customer.
B．Waiter and diner.
C．Professor and student.
D．Manger and secretary.
单项选择题
A．George Washington.B．Thomas Jefferson.C．James Madison.D．Abraham Lincoln.
A．George Washington.
B．Thomas Jefferson.
C．James Madison.
D．Abraham Lincoln.
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