单项选择题

A．Animals live in more natural environments.
B．Trees and grass grow in the cages.
C．A deep ditch filled with water surrounds the area where animals live.
D．All of the above.
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单项选择题
A．An analysis of early presidential elections.B．A comparison of political journals.C．The use of computers in calculating election results.D．The impact of television on recent presidential elections.
A．An analysis of early presidential elections.
B．A comparison of political journals.
C．The use of computers in calculating election results.
D．The impact of television on recent presidential elections.
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