2. 外语
  3. According to the passage, a volcano sends out ______. When lava cools, it becomes ______.

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

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问题 According to the passage, a volcano sends out ______.
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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