A．A community of plants.B．A community of animals.C．The -找考题网

单项选择题

A．A community of plants.
B．A community of animals.
C．The study and understanding of plants and animals.
D．The interacting physical factors of the environment.

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单项选择题

A．Navigation.B．Drainage.C．Irrigation.D．Electricity.

A．Navigation.
B．Drainage.
C．Irrigation.
D．Electricity.

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