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．In a library.B．In a school.C．In a bookstore.D．In a publisher’s offer.
A．In a library.
B．In a school.
C．In a bookstore.
D．In a publisher’s offer.
单项选择题
A．American literature.B．Elementary education.C．Art history.D．Experimental medicine.
A．American literature.
B．Elementary education.
C．Art history.
D．Experimental medicine.
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