For relatively dry soil which is under sufficient water supply conditions, the physical process of infiltration can be divided into three stages, which are in turn（）
A. penetration stage-seepage stage-leakage stage
B. leakage stage-seepage stage- penetration stage
C. seepage stage-leakage stage-penetration stage
D. seepage stage-penetration stage-leakage stage
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Even for causal relationships, there are a variety of casualties: linear, domino, cyclic, relational, mutual and spiraling. Please select from the following statements the one that represents one uniq
A. Has a clear beginning and a clear ending
B. Involves feedback loops
C. Sequential unfolding of effects over time
D. —
The drainage area refers to which is above a certain cross section of the river（）
A. the sum of the areas enclosed by the ground water watershed and the underground water watershed
B. the horizontal projected area enclosed by underground watershed
C. the area enclosed by the ground watershed
D. the horizontal projected area enclosed by the ground watershed
One cause may yield a long-term effect as well as an immediate effect. Please select from the following effects the long-term effect in the case of a construction worker who decided to go back to coll
A. Having to budget his money more carefully because he had to quit his job
B. Securing a high-paying, white-collar position after graduation
C. Getting a lot less physical exercise
D. —
Please select from the following choices the one that is not typical of features of a good solution（）
A. Effective at solving the problem
B. Implemented quickly
C. Feasible
D. —
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