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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transportation
单项选择题
A．How Aswan Dam Was Built.B．How Holland Solved Its Drainage Problem.C．Transporting with Canal Boats.D．Canals and Their Uses.
A．How Aswan Dam Was Built.
B．How Holland Solved Its Drainage Problem.
C．Transporting with Canal Boats.
D．Canals and Their Uses.
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