单项选择题

A．Identifying and collecting food.
B．Protecting themselves.
C．Eating food.
D．Fighting against the enemies.
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单项选择题
Two recent papers in Science magazine claim to have found evidence which contradicts the traditional notion that _________.
A．relatively harsh environments are the nurseries of evolution
B．evolution occurred in regions with biological diversity
C．new forms of life come into being in near-shore areas
D．species of birch and redwood originated in the south
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