According to the passage, a volcano sends out ______. [br] When lava cools, it b

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问题 According to the passage, a volcano sends out ______. [br] When lava cools, it becomes ______.

选项 A、liquid
B、water
C、smoke
D、hard

答案 D

解析细节题。由文章第四段“After a while the volcano becomes quiet again. The melted lava becomes hard.”可知：熔岩冷却后会变硬。

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Whatisthemainideaofthepassage?[br]Inthesentence."Freuddevelopedpsy