单项选择题

A．positive
B．negative
C．optimistic
D．pessimistic
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单项选择题
A．entertain and advertiseB．educate and advertiseC．educate and entertainD．be informative and instructive
A．entertain and advertise
B．educate and advertise
C．educate and entertain
D．be informative and instructive
单项选择题
Which of the following is most likely to be the subject of study by a geohydrologist
A．Soft, porous rock being worn away by a waterfall.
B．Water depositing minerals on the banks of a gorge through which the water runs.
C．Trapping of water in a sealed underground rock cavern due to an earthquake.
D．Water becoming unfit to drink through the release of pollutants into it from a plant.
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