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
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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. —
In natural world, the hydrological cycle between land and sea is called（）
A. Inland small cycle
B. Small loop
C. Large loop
D. Ocean water cycle
The occurrence of hydrological phenomena is（）
A. completely accidental
B. completely inevitable
C. completely random
D. both inevitable and random
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