单项选择题

A．taking further photos
B．taking soil samples
C．planting vegetation in the soil
D．taking samples of vegetation
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单项选择题
A．should remain effectiveB．should be abolishedC．should be discussed againD．should be supplemented
A．should remain effective
B．should be abolished
C．should be discussed again
D．should be supplemented
单项选择题
A．One.B．Two.C．Three.D．Fiv
A．One.
B．Two.
C．Three.
D．Fiv
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