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introducing→introduced
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A．They are newer than the formations in most caves.B．They were formed by sulfuric acid.C．They have been artificially preserved.D．They are smaller than those in any other cave.
A．They are newer than the formations in most caves.
B．They were formed by sulfuric acid.
C．They have been artificially preserved.
D．They are smaller than those in any other cave.
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What should parents come to realize according to the last paragraph
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