The trapping of water in a sealed underground rock cavern through the action
of an earthquake
Water becoming unfit to drink through the release of pollutants into it from a manufacturing plant
The changing course of a river channel as the action of the water wears away the rocks past which the river flows
2. The author refers to many formations primarily in order to
clarify a distinction
introduce a subject
draw an analogy
emphasize a similarity
resolve a conflict
答案:C/A
上文的题目大家答对了几题?大家不仅要多做题,更要善于总结,这样才会有针对性地提高。
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