Question

【題目】 Bob Christiansen, who studied the volcanic history of Yellowstone National Park in the 1960s, became puzzled about something that, oddly, had not troubled anyone before: he couldn’t find the park’s volcano. It had been known for a long time that Yellowstone was volcanic in nature—that’s the reason for all its hot springs and other steamy features. But Christiansen couldn’t find the Yellowstone volcano anywhere.

Most of us, when we talk about volcanoes, think of the classic cone (圓錐體) shapes of a Fuji or Kilimanjaro,which are created when erupting magma(巖漿) piles up. These can form remarkably quickly. In 1943, a Mexican farmer was surprised to see smoke rising from a small part of his land. In one week he was the confused owner of a cone five hundred feet high. Within two years it had topped out at almost fourteen hundred feet and was more than half a mile across. Altogether there are some ten thousand of these volcanoes on Earth, all but a few hundred of them extinct. There is, however, a second less known type of volcano that doesn’t involve mountain building. These are volcanoes so explosive that they burst open in a single big crack, leaving behind a vast hole, the caldera(火山噴口). Yellowstone obviously was of this second type, but Christiansen couldn’t find the caldera anywhere.

Just at this time NASA decided to test some new high-altitude cameras by taking photographs of Yellowstone. A thoughtful official passed on some of the copies to the park authorities and said that they might make a nice blow-up for one of the visitors’centers. As soon as Christiansen saw the photos, he realized why he had failed to spot the caldera: almost the whole park-2.2 million acres—was caldera. The explosion had left a hole more than forty miles across—much too huge to be seen from anywhere at ground level. At some time in the past Yellowstone must have blown up with a violence far beyond the scale of anything known to humans.

【1】What puzzled Christiansen when he was studying Yellowstone？

【2】Is Fuji or Kilimanjaro created when erupting magma piles up?

【3】What does the second paragraph mainly talk about？

【4】When did Christiansen realize why he had failed to spot the caldera?

【5】What was the caldera of Yellowstone?

Answer 1

【答案】

【1】The exact location of the volcano.

【2】Yes, it is.

【3】The shapes of volcanoes.

【4】In the 1960s.

【5】The whole park.

【解析】

本文是一篇說明文。在20世紀(jì)60年代，在研究黃石國家公園的火山歷史時，鮑勃克里斯蒂安對一些奇怪的事情感到困惑，他找不到公園的火山，他產(chǎn)生了疑惑。原來這兒的火山并不是像我們大部分人想象的那種圓錐體形狀的樣子，是一個巨大的洞，這個洞太大以至于從地面上的任何地方都看不見。

【1】根據(jù)文章第一段第一句“…h(huán)e couldn’t find the park’s volcano.”可知，Bob Christiansen關(guān)于黃石國家公園的困惑是找不到火山在這里的位置，首字母大寫，故答案為The exact location of the volcano.

【2】根據(jù)第二段首句“Most of us, when we talk about volcanoes, think of the classic cone shapes of a Fuji or Kilimanjaro, which are created when erupting magma piles up.”可知，人們所熟知的火山形狀就是經(jīng)典的圓錐體形狀，就像富士山或乞力馬扎羅那樣，它是由噴發(fā)出來的巖漿堆積而成的，所以答案是肯定的，首字母大寫，故答案為Yes, it is.

【3】根據(jù)第二段首句“Most of us, when we talk about volcanoes, think of the classic cone shapes of a Fuji or Kilimanjaro, which are created when erupting magma piles up.”可知，人們所熟知的火山形狀就是經(jīng)典的圓錐體形狀，就像富士山或乞力馬扎羅那樣，它是由噴發(fā)出來的巖漿堆積而成的。這是本段第一句，是一個主題句，所以本段主要介紹的是火山的形狀，首字母大寫，故答案為The shape of volcanoes。

【4】根據(jù)第一段第一句“Bob Christiansen, who studied the volcanic history of Yellowstone National Park in the 1960s…”可知，他在20世紀(jì)60年代研究黃石國家公園的火山歷史，根據(jù)最后一段第一句“Just at this time NASA decided to test some new high-altitude cameras by taking photographs of Yellowstone.”可知，就在那個時間，NASA決定通過拍照片的方式來測試……，所以時間就是20世紀(jì)60年代。首字母大寫，故答案為In the 1960s.

【5】根據(jù)最后一段第三句“…h(huán)e realized why he had failed to spot the caldera; almost the whole park-2.2 million acres—was caldera.”可知，火山口就是整個公園，220萬英畝。首字母大寫，故答案為The whole park.