单项选择题

This was the worst violence

A．in the U. S. S. R. since August 1991
B．in the country since 1991
C．in the city since the disintegration of the Soviet Union in August 1991
D．in the city since 1991
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单项选择题
How can the satellites catch the information about the soil
A．By turning the intensity of sunshine into maps.
B．By analyzing the recent weather report.
C．By capturing the microwave radiation from the soil.
D．By analyzing information provided by ground observation centers.
单项选择题
How can the group carry out their study
A．By using Satellite images, maps, etc.
B．By studying specific fanning methods.
C．By studying the variation of human population.
D．By analyzing the quality of crops.
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