The characteristics of convective rainfall are（）
A. large rainfall intensity , large rain area and long rainfall duration
B. small rainfall intensity, small,rain area and short rainfall duration
C. large rainfall intensity, small rain area and short rainfall duration
D. small rainfall intensity, large rain area and long rainfall duration
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There are also some key linguistic concepts commonly used in SPSE writing. Please select from the following choices the one that is not used to discuss the extent of the problem（）
A. The problem is quite serious because …
B. As far as I can see, the main problem is …
C. If the problem is not dealt with …
D. —
The occurrence and development of hydrological phenomena are accidental, therefore, their occurrence and changes（）
A. is disorganized
B. has statistical pattern
C. is with complete certainty pattern
D. has no pattern
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
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. —
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