The collapse of the Earth’s magnetic
field—which guards the planet and guides many of its creatures—appears to have
started seriously about 150 years ago, the New York Times reported last
week. The field’s strength has decreased by 10 or 15 per cent so
far and this has increased the debate over whether it signals a reversal of the
planet’s lines of magnetic force. During a reversal, the main
field weakens, almost vanishes, and reappears with opposite polarity. The
transition would take thousands of years. Once completed, compass needles that
had pointed north would point south. A reversal could cause problems for
both man and animals. Astronauts and satellites would have difficulties.
Birds, fish and animals that rely on the magnetic field for navigation would
find migration confusing. But experts said the effects would not A. the transition is still thousands of years away B. the new transition will come 780 000 years from now C. the transition can be precisely predicted by scientists D. the process of the transition will take a very long time to finish
更多"Passage Five
The collapse"的相关试题:
[单项选择] Passage Five
The collapse of the Earth’s magnetic
field—which guards the planet and guides many of its creatures—appears to have
started seriously about 150 years ago, the New York Times reported last
week. The field’s strength has decreased by 10 or 15 per cent so
far and this has increased the debate over whether it signals a reversal of the
planet’s lines of magnetic force. During a reversal, the main
field weakens, almost vanishes, and reappears with opposite polarity. The
transition would take thousands of years. Once completed, compass needles that
had pointed north would point south. A reversal could cause problems for
both man and animals. Astronauts and satellites would have difficulties.
Birds, fish and animals that rely on the magnetic field for navigation would
find migration confusing. But experts said the effects would not A. begun to change in the opposite direction B. been weakening in strength for a long time C. caused the changes on the polarities D. misguided many a man and animal
[单项选择]
Passage Five
The collapse of the Earth’s magnetic field—which guards the planet and guides many of its creatures—appears to have started seriously about 150 years ago, the New York Times reported last week.
The field’s strength has decreased by 10 or 15 per cent so far and this has increased the debate over whether it signals a reversal of the planet’s lines of magnetic force.
During a reversal, the main field weakens, almost vanishes, and reappears with opposite polarity. The transition would take thousands of years. Once completed, compass needles that had pointed north would point south. A reversal could cause problems for both man and animals. Astronauts and satellites would have difficulties. Birds, fish and animals that rely on the magnetic field for navigation would find migration confusing. But experts said the effects would not be a big disaster, despite claims of doom and vague evidence of links between past field re A. the flows of melted iron inside the Earth B. the periodical movement of the Earth
[填空题]This passage outlines five strategies for making parents wise consumers.
[单项选择]Passage One
Five or six years ago, I attended a lecture on the science of attention. A philosopher who conducts research in the medical school was talking about attention blindness, the basic feature of the human brain that, when we concentrate intensely on one task, causes us to miss just about everything else. Because we can’t see what we can’t see, our lecturer was determined to catch us in the act. He had us watch a video of six people tossing basketballs back and forth, three in white shirts and three in black, and our task was to keep track only of the tosses among the people in white. The tape rolled, and everyone began counting.
Everyone except me, I’m dyslexic (有阅读障碍的),and the moment I saw that grainy tape with the confusing basketball tossers, I knew I wouldn’t be able to keep track of their movements, so I let my mind wander. My curiosity was aroused, though, when about 30 seconds into the tape, a gorilla (大猩猩)came in among the players. She (we later learned A. basketball B. an experiment C. a philosopher D. a gorilla
[单项选择] Passage Five
There Pictures from outer space now
show us how much land has changed on earth. These images are taken by Landsat 7,
a government satellite. The satellites have been used for 27 years. They reveal
the clear-cutting of forests in the northwestern part of the United States.
Pictures show the loss of rain forests in South America. NASA’s
Darrel Williams speaks about the Landsat 7 Project. He said that an eruption
caused trees to bum up in a large forest. Fifteen years later, pinkish images
from space show that the trees and plant life are growing again. Williams says
that clear-cut areas easily show up in the pictures. He wants Americans to look
at how much land is being cleared of forests in our country.
Satellites have provided other information about changes on earth. In the
past ten years, more than four miles have shrunk A. sightseers have noted the changes B. computer-animated views have shown the shrinkage C. one of the glaciers was hit by a ship D. the temperatures are much colder
[单项选择]Passage Two
Five or six years ago, I attended a lecture on the science of attention. A philosopher who conducts research in the medical school was talking about attention blindness, the basic feature of the human brain that, when we concentrate intensely on one task, causes us to miss just about everything else. Because we can’t see what we can’t see, our lecturer was determined to catch us in the act. He had us watch a video of six people tossing basketballs back and forth, three in white shirts and three in black, and our task was to keep track only of the tosses among the people in white. The tape rolled, and everyone began counting.
Everyone except me, I’m dyslexic (有 阅读障碍 的),and the moment I saw that grainy tape with the confusing basketball tossers, I knew I wouldn’t be able to keep track of their movements, so I let my mind wander. My curiosity was aroused, though, when about 30 seconds into the tape, a gorilla (大 猩 猩)came in among the players. She (we later learned a f A. seeing one thing while missing all else B. the fact that one can’t see what one can’t see C. keeping track of just about everything D. the condition of being blind to details
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