According to Plumptre, the region over which a dung-pile census is carried out should be
A.small enough.
B.well protected.
C.carefully monitored.
D.large enough.
正确答案是D
According to Plumptre, the region over which a dung-pile census is carried out should be
A.small enough.
B.well protected.
C.carefully monitored.
D.large enough.
正确答案是D