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

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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