题目内容：
根据所听内容及提问，作答____[A] They are found under the oceans.
[B] They were most active when earth was first formed.
[C] Their emissions created earth's atmosphere.
[D] Their fumes are mostly water in the state of a gas.
参考答案：
答案解析：
单选题：根据所听内容及提问，作答____[A] They are found under the oceans. [B] The
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[A] They are found under the oceans.
[B] They were most active when earth was first formed.
[C] Their emissions created earth's atmosphere.
[D] Their fumes are mostly water in the state of a gas.