单项选择题

A．China and USA
B．Chile and France.
C．France and Canada.
D．Egypt and Greece.
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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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