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
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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
Water is a type of（）
A. inexhaustible resource
B. renewable resource
C. non-renewable resource
D. unlimited resource
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