单项选择题

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

Separate containers are used for individual specimens.
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单项选择题
Little time and effort is required.
Little time and effort is required.
单项选择题
It is a good method for species which are hard to find.
It is a good method for species which are hard to find.
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