单项选择题

A．hand collecting
B．using bait
C．sampling ground litter
D．using a pitfall trap

It is particularly effective for wet habitats.
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单项选择题
It is preferable to take specimens from groups of ants.
It is preferable to take specimens from groups of ants.
填空题
A single collection of ants can generally be used for both taxonomic and ecological purposes.
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