单项选择题

A．longest defended border
B．longest undefended border
C．longest undefined border
D．longest coastal border
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单项选择题
A．taking further photosB．taking soil samplesC．planting vegetation in the soilD．taking samples of vegetation
A．taking further photos
B．taking soil samples
C．planting vegetation in the soil
D．taking samples of vegetation
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
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