四六级

　　在四级考试中，听力是考生最不好把握的一个部分了，许多考生没能通关很大一部分原因就是听力拖了后腿。以下是小编为大家准备的听力考前冲刺练习，因为在练习中熟练技巧，总结经验才是最好的方法。

 英语四级听力冲刺练习30

　　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.

　　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。

　　听力原文：

　　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?

         以上就是小编为大家提供的四级听力冲刺训练，大家快来练习吧！四六级备考正值冲刺阶段，文都网校为大家推出了2017年6月四六级考前冲刺备考专题，希望能帮助到大家！