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2019高考江苏卷阅读理解Inthe1960s
In the 1960s,while studying the volcanic history of Yellowstone National Park,
Bob Christiansen 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 what accounted 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(圆锥体)
shapes of a Fuji or Kilimanjaro,which are created when erupting magma(岩浆)
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 les 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.
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 on the assumption 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.
58. What puzzled Christiansen when he was studying Yellowstone?
A. Its complicated geographical features.
B. Its ever-lasting influence on tourism.
C. The mysterious history of the park.
D. The exact location of the volcano.
59. What does the second-paragraph mainly talk about?
A. The shapes of volcanoes.
B. The impacts of volcanoes.
C. The activities of volcanoes.
D. The heights of volcanoes.
60. What does the underlined word 'blow-up' in the last paragraph most
probably mean?
A. Hot-air balloon. B. Digital camera.
C. Big photograph. D. Bird's view.
答案 58.D 59.A 60.C
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