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[主观题]

听力原文：M: The volcanic ash from the eruption of Mount Saint Helens certainly caused a lo

t of damage, didn't it？

W: It did, but not as much as experts have predicted. It seems to have had a beneficial effect as well.

M: Really？ But were crop losses great？

W: Yes. However, since the weather following the eruption was unexpectedly good, some crop yields remain steady or even increase beyond normal expectancy level.

M. I'm glad to hear that. But what was the beneficial effect you mentioned？

W: A mass destruction of various insect population.

M: How could the ash kill insects without effecting people too？

W: It's highly abrasive and quickly wears away the outer wax layer protecting insect bodies. Removal of that layer causes the insects to lose body moisture by evaporation, the result is usually lethal.

(23)

A．The crops were obliterated for the entire year.

B．The crops nutritional value was considerably lessened.

C．The soil was permanently damaged.

D．The loss was not as bad as had been anticipated.

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发布时间：2020-07-30

更多“听力原文：M: The volcanic ash from the eruption of Mount Saint Helens certainly caused a lo”相关的问题

第1题

听力原文：M: How did you like yesterday's astronomy class？W: It was interesting. But the po

听力原文：M: How did you like yesterday's astronomy class？

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

M: Oh, that new theory that ocean water came from comets？

W: Yeah. Do you remember what it was based on？

M: Some recent satellite photos, I think. Apparently, Space satellites recently detected thousands of small comets colliding. with earth's outer atmosphere, almost 40,000 per day.

W: OK, they're collided with atmosphere. So that's what created the water？

M: It's not the collision, that created water. 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 they contain rains down to earth. Ocean water came from that rain.

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

M: Why not？

W: Special research indicates that most of the water molecules from the comet would have burned up as they fell through the atmosphere. Enough rain couldn't have reached the earth to fill up the ocean.

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

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

M: From volcanoes？

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

(20)

A．The effect of the atmosphere on rainfall.

B．How water originated on earth.

C．How conditions on earth support life.

D．A new estimate of the age of earth.

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第2题

听力原文：M: Hello. This is Greg Rice reporting live in Barrow, Alaska.W: Hello, Greg. Is e

听力原文：M: Hello. This is Greg Rice reporting live in Barrow, Alaska.

W: Hello, Greg. Is everything going smoothly？

M: Yes. I've just arrived here in Barrow, Alaska, to bring you live coverage of what appears to be the results of a huge meteorite impact, perhaps the largest in recent history, that occurred just twelve hours ago. The exact location of the impact is unknown, but estimates put it about 20 kilometers south of Barrow based on shock waves felt throughout the region.

W: Are there any witnesses？

M: Yeah. Some witnesses say they saw a bright light streaking through the sky, accompanied by a roaring boom, moments before the impact. It's unknown whether there are any casualties, but it is unlikely considering this sparsely populated area.

W: It's said that such impacts were commonplace during the formation of our solar system, and many believe that a meteorite 10 kilometers in diameter which crashed into Earth 65 million years ago led to the mass extinction of many animal species including the dinosaurs.

M: You're right. But it is often difficult to calculate the number of such large impacts on Earth because erosion and vegetation make it difficult to spot them. In recent years, astronomers have focused more of their attention on the paths of many uncharted space rocks or asteroids floating out there in the hope that we might be able to determine the threat they pose on mankind...This is Greg Rice reporting from Alaska.

W: Thanks, Greg...We'll keep you up-to-date on any development there.

(23)

A．An alien spacecraft landing.

B．The impact of a meteorite.

C．A volcanic eruption.

D．The blizzard conditions in Alaska.

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第3题

听力原文： Seismologists report that an earthquake was recorded in the northern islands of

Japan today at approximately 6:30 A.M. Tremors were felt as far away as Hawaii. This is the third earthquake that has occurred in that area since the beginning of this year. The last one occurred just two months ago. Fortunately, no one was reported hurt, and there was little damage to property. According to scientists, this recent series of minor tremors indicate that a more serious incident could occur in that area in the near future.

What happened in Japan today？

A．There was a riot.

B．There was a tidal wave.

C．There was a volcanic eruption.

D．There was an earthquake.

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第4题

听力原文： Living at the foot of one of the world' s most active volcanoes might not appeal

to you at all. But believe it or not, the area surrounding Mount Etna in Italy is packed with people. In fact, it is the most densely populated region on the whole island of Sicily. The reason is that rich volcanic soil makes the land fantastic for farming. By growing and selling a variety of crops, local people earn a good living. For them, the economic benefit they reap surpasses the risk of dying or losing property in one of the volcano's frequent eruptions. People everywhere make decisions about risky situations this way. That is, by comparing the risks and the benefits. According to the experts, the side of the risk depends on both its probability and seriousness. Let's take Mount Etna for example, It does erupt frequently, but those eruptions are usually minor. So the overall risk for people living nearby is relatively small. But suppose Mount Etna erupted everyday, or imagine that each eruption there kills thousands of people. If that were the case, the risk would be much larger. Indeed, the risk would be too large for many people to live with. And they would have to move away.

How do people make decisions about risky situations？

A．By judging to what extent they can eliminate the risks.

B．By estimating the possible loss of lives and property.

C．By estimating the frequency of volcanic eruptions.

D．By judging the possible risks against the likely benefits.

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第5题

听力原文：M: Hey, Sue. I was wondering if you could fill me in on Monday's class. I had to

go the dentist for an emergency and I missed Prof. Smith's lecture. What was it on？

W: It was pretty interesting. She talked about volcanoes, active volcanoes, under the -- uh -- West Antarctic ice sheet.

M: There ere active volcanoes under the ice？

W: Apparently so. She said they help protect the ice sheet and prevent melting. Flooding would be pretty bad if that ice melted, not only there, but all over the world.

M: You lost me there. Volcanoes are hot. How can something hot prevent ice from melting？

W: Wait a minute, let me check my notes. Yeah, here it is. Volcanic heat melts just enough ice to create a slippery surface on the bottom of the glacier. This water allows ice to flow out into the ocean. So the solid interior ice is protected from the ocean's warmth. Does that make sense？

M: Son of. You mean that because the ice is flowing out to the ocean, the warmer ocean water can't flow in.

W: Exactly. And the ice that melts is constantly being replaced by snow. Prof. Smith said that if the ice sheet ever broke up and melted, the sea level would go up seven meters. Then we would have those floods.

M: Is that really possible？ Or is it one of those exaggerations you hear all the time？

W: As far as I can understand, it is possible, because of global warming. I mean if the ocean got a lot warmer that interior ice would be very likely to melt.

M: Thanks for telling me about the lecture. Sounds like I've missed a pretty important class.

Why did the man ask about the lecture？

(20)

A．He wasn't present at the lecture.

B．He didn't listen to the lecture attentively.

C．He didn't appreciate the lecture.

D．He disliked some part of the lecture.

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第6题

听力原文：Surtsey was born in 1963. It was a great event for scientists. They were lucky en

听力原文： Surtsey was born in 1963. It was a great event for scientists. They were lucky enough to see the birth of this volcanic island. It began at 7: 30 a.m. on 14th November. A fishing boat was sailing near Iceland. The boat moved under the captain's feet. He noticed a strange smell. He saw some black smoke. A volcano was erupting. The bottom of the grey Atlantic was open. Red-hot rocks, flames and smoke were rushing up from a split in the sea-bed. The island grew quickly. It was 10 meters high the next day and 60 meters high on 18th November. Scientists flew to Reykiavik to watch. It was very exciting. Smoke and flames were still rushing up. Pieces of red-hot rock were flying into the air and falling into the sea. The sea was boiling and there was a strange light in the sky. Surtsey grew and grew. Then it stopped in June 1967. It was 175 meters high and 2 kilometers long. And life was already coming to Surtsey. Seeds came over the sea. Plants grew. Birds came. Some scientists built a house to learn about the young island. A new island is like a new world.

(33)

A．The smoke and flames of the volcano.

B．The red hot rock that came from the volcano.

C．The middle of the earth in the sea.

D．An island near Reykiavik in Iceland.

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第7题

听力原文：Could you please turn on the light？（10)A．OK.B．No, I won't.C．I'm cold.

听力原文：Could you please turn on the light？

(10)

A．OK.

B．No, I won't.

C．I'm cold.

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第8题

听力原文：Are you free tomorrow？（13)A．Yes, I'm not.B．No, I am.C．Yes, I am.

听力原文：Are you free tomorrow？

(13)

A．Yes, I'm not.

B．No, I am.

C．Yes, I am.

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第9题

听力原文：W: How are you？（10)A．Fine, thank you.B．I'm reading.C．I'm in the office.

听力原文：W: How are you？

(10)

A．Fine, thank you.

B．I'm reading.

C．I'm in the office.

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