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1. What is the main idea of the passage?
It's about modern caveman.
2. With what does the writer compare the Gouffre Berger?
1 Entered narrow gap ---- climbed down steep sides ---- came to narrow corridor
2 Edged way along ---- often through water
3 Suddenly came to deep waterfall ---- dropped into underground lake
4 Loaded gear into inflatable rubber dinghy ---- then plunged into lake ---- special rubber suits
5 Far end of lake ---- heard sounds of waterspout
6 Then reached enormous cavern ---- powerful lights, saw massive stalagmites and stalactites
7 Piles of limestone ---- glistening all colours ---- sound of continuously dripping water
