With what topic is the passage primarily concerned? The second paragraph mentions all of the following as necessary elements in

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问题 With what topic is the passage primarily concerned?
The second paragraph mentions all of the following as necessary elements in the creation of steam caves EXCEPT ______.

选项 A、a glacier
B、a crater
C、heat
D、snow

答案A

解析 第二段最后一句提到“汽洞的形成需要火山汽和热的稳定散发,每年大量降雪以及一个碗状的火山口,使雪覆盖足够厚防止夏天融化”,所以只有A未提及。
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