25. They are found under the oceans.
They were most active when earth was first formed.
Their emissions created earths atmosphere.
Their fumes are mostly water in the state of a gas.
Conversation One
19.B综合推断题。女士说This food is terrible.I cant even finish my dinner.男士说the university could hire a better food service,结合这两句话可以推断,对话发生在食堂,所以B正确。
20.C信息明示题。女士说Im going over to the student recreation center to play some bridge.接下来男士问You are spending your time on a card game?此可知,女士计划晚上play bridge,故选C。
21.D信息明示题。男士说You should be caleful not to play so much that you dont get your studying done.所以D正确。
22.D信息明示题。男士说I have a pretty heavy workload this semester.I have to spend my evenings studying.由此可知,男士这学期的学业很重,他晚上也要学习,故选D。
Conversation Two
23.C综合推断题。男士在对话开始时提到了海水来自彗星这一新理论,接下来的对话主要就是围绕该理论展开的,最后还引出了海水来自火山这一传统理论,由此推断,对话主要与地球上水的来源,特别是海水的来源有关,故选C。
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