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

游客2024-06-30  10

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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