听力试题

听力对话试题

Questions 23 to 25 are based on theconversation you have just heard.

23.

[A] The effect of the atmosphere onrainfall.

[B] How conditions on earth support life.

[C] How water originated on earth.

[D] A new estimate of the age of earth.

24.

[A] The surface of the ocean is expanding.

[B] Volcanic activity is increasing.

[C] The surface of earth contains tons of cosmicdust.

[D] Thousands of comets are colliding withearth’s atmosphere.

25.

[A] They are found under the oceans.

[B] They were most active when earth wasfirst formed.

[C] Their emissions created earth’satmosphere.

[D] Their fumes are mostly water in thestate of a gas.

对话原文

听力对话原文

Conversation Two

M: How did you like yesterday’s astronomyclass?

W: It was interesting. But the point shewas trying to make seemed a little far-fetched.

M: Oh, that new theory that ocean watercame from comets?

W: Yeah. Do you remember what it was basedon?

M: Some recent satellite photos, I think.Apparently, space satellites recently detected thousands of small cometscolliding with earth’s outer atmosphere, almost 40,000 per day.

W: OK, they’re collided with atmosphere. Sothat’s what created the water?

M: It’s not the collision that createdwater. Comets contain water. They’re made up mostly of cosmic dust and water.When they collide with the atmosphere, they break up. And the water theycontain rains down to earth. Ocean water came from that rain.

W: Oh well, this morning I asked my geologyprofessor about that. He said that most geologists don’t accept it.

M: Why not?

W: Special research indicates that most ofthe water molecules from the comet would have burned up as they fell throughthe atmosphere. Enough rain couldn’t have reached the earth to fill up theocean.

M: Well, did the geologists have analternative theory to explain where ocean water came from?

W: Yeah, he said the more traditional viewis that the ocean water came from volcanoes.

M: From volcanoes?

W: Right. They say volcanic fumes aremostly steam. And they claimed that it was the volcanic steam that created theoceans, not rain from comets.

Questions 23 to 25 are based on theconversation you have just heard.

23. What are the speakers mainlydiscussing?

24. What did recent photographs from aspace satellite indicate?

25.What aspect of volcanoes does the woman mention?

答案和解析

听力对话答案

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。

24．D信息明示题。男士说海水来源的新理论是基于最近人造卫星所拍摄的照片的，宇宙人造卫星最近探测到，每天有将近四万颗小彗星与地球外层大气相碰撞，故选D。

25．D信息明示题。女士指出，地质学者认为火山气体大多为蒸汽，故选D。

*考点

●fill sth．up意为“填写，填满，充满”，与fill相关的短语还有：fin sb．’s shoes接替某人的工作、职务等；fill in(for sb．)临时接替某人；fill sth．in除了指“填写，补充，填满”以外，还可指“打发，消磨(时间)”，如：Jack filled in the afternoon watching television．杰克以看电视打发下午的时间。