单项选择题

A．All creatures live on one another.
B．Plants are more important than animals.
C．Animals are more important than plants.
D．Ecosystem has been destroyed by animals.
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convenience
单项选择题
A．Dr. Smith.B．Dr. Smith’s wife.C．A patient.D．A receptionist.
A．Dr. Smith.
B．Dr. Smith’s wife.
C．A patient.
D．A receptionist.
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