单项选择题

A．taking further photos
B．taking soil samples
C．planting vegetation in the soil
D．taking samples of vegetation
<上一题 目录 下一题>
热门 试题

填空题
five-year
单项选择题
A．One.B．Two.C．Three.D．Five.
A．One.
B．Two.
C．Three.
D．Five.
相关试题