单项选择题

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

It is a good method for species which are hard to find.
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单项选择题
It is particularly effective for wet habitats.
It is particularly effective for wet habitats.
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.
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