单项选择题

A．They are unreasonable.
B．They are varied.
C．They are untraceable.
D．They are identical.
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单项选择题
A．Repeated measurements of the sizes of ants.B．Systematic observations of ants and nests.C．Simulated experiments on ants behavior.D．Gathering sample nests and ants.
A．Repeated measurements of the sizes of ants.
B．Systematic observations of ants and nests.
C．Simulated experiments on ants behavior.
D．Gathering sample nests and ants.
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