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
单项选择题
A．Ask Dr. Smith to alter his decision.B．Ask Dr. Smith to call the library.C．Get the book directly from Dr. Smith.D．Get Dr. Smith’’s written permission.
A．Ask Dr. Smith to alter his decision.
B．Ask Dr. Smith to call the library.
C．Get the book directly from Dr. Smith.
D．Get Dr. Smith’’s written permission.
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