According to the passage, a volcano sends out ______. Lava bursts out where there is ______.

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问题 According to the passage, a volcano sends out ______.
Lava bursts out where there is ______.

选项 A、a crack in the earth
B、a mountain by the sea
C、a big fire
D、steam and gas

答案A

解析 细节题。由文章第三段中前两句话可以得知:地球表面有的地方比较薄不太结实,造成裂缝的出现。熔岩就会从这些裂缝中喷发出来。
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