阿摩線上測驗
22. What is the most dangerous part of a volcano eruption?
(A) Gas and ash
(B) Thick air
(C) Pyroclastic flow
(D) Explosion
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統計： A(176), B(87), C(349), D(210), E(0) #1899790
統計： A(176), B(87), C(349), D(210), E(0) #1899790
