The total evaporation of the watershed includes（）
A. water surface evaporation, land surface evaporation and plant evapotranspiration
B. water surface evaporation, soil evaporation and land surface evapotranspiration
C. land surface evaporation, plant evapotranspiration and soil evaporation
D. water surface evaporation, plant evapotranspiration and soil evaporation
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We can trace many causes for the occurrence and development of hydrological phenomena. Therefore, the change in hydrological phenomena（）
A. has a completely deterministic pattern
B. has a completely statistical pattern
C. has causality pattern
D. has no pattern
The reason for making water resources regenerative is of natural（）
A. run-off
B. hydrological cycle
C. evaporation
D. precipitation
The condition for the formation of heavy rain is（）
A. the area which has sufficient water vapor sources and high temperature
B. the area which has sufficient water vapor sources and low temperature
C. the area which has sufficient water vapor sources and strong upward movement of air
D. the area which has sufficient water vapor sources and no strong upward movement of air
Hydrological forecasting is to predict the scale and time course of a hydrological variable（）
A. during any period
B. during a foreseeable period
C. since a long time ago
D. at a certain moment
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