47. What are “active volcanoes”?
(A) volcanoes that move
(B) volcanoes no longer able to erupt
(C) volcanoes that can erupt
(D) volcanoes that can erupt when you play music
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什麼是活火山？(A) volcanoes...
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許多人依靠火山生存。火山的地熱能可以為附...
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