单项选择题

A．strong win& and lack of water
B．rapid economic growth
C．locked doors and windows
D．overcrowded people
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单项选择题
A．popularizationB．pauseC．developmentD．ignorance and confusion
A．popularization
B．pause
C．development
D．ignorance and confusion
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
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