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Cells cannot remain alive outside certain limits of temperature and much narrower limits mark the boundaries of effective functioning. Enzyme systems of mammals and birds are most efficient only withi

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1. 3 college students were arrested Wednesday for allegedly setting fire to 9 Baptist churches across Alabama. One of the suspects allegedly said the first fires were set as a joke. The others were st

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英语短文：Cells and Temperature Cells cannot remain alive outside certain limits of temperature and much narrower limits mark the boundaries of effective functioning. Enzyme systems of mammals and birds are most efficient only within a narrow ra

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Earth's magnetic field has reversed thousands of times since its formation 4.5 billion years ago. And scientists now believe that the next reversal is imminent. The race is on to predicting exactly when it will occur. In 2010, the European Space Agen

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As the reversal approaches, the decay of our magnetic field will continue and cosmic radiation will get increasingly close to the Earth's surface. As the reversal approaches, the decay of our magnetic field will continue and cosmic radiation will get

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Glatsmire's model shows that the magnetic poles swap places spontaneously due to / complex processes within the core. We were used to the idea that a compass points somewhere near the North Pole and hence we can use it for navigation, but there are p

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By analyzing thousands of lava samples, geophysicists discover/ that the Earth's magnetic field has reversed over 18,000 times in the last 20 million years. On either side of these reversals is a long period of dramatically reduced field strength. Du

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The United States Wednesday vigorously condemned the military overthrow of the Mauritanian government and called for the restoration of democratic rule. The coup could lead to sanctions by the United States and European Union. VOA's David Gollust re

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Barbara Walters did a story on gender roles in Kuwait several years before the Gulf War. She noted then that women customarily walked about 10 feet behind their husbands. She returned to Kuwait recently and observed that the men now walked several ya

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Do you know the open-air art gallery in London's Blackall Street? Not many Londoners know it either, but Henri does and he is willing to show it to you. Henri used to sleep rough until he met a charity that helps homeless people get back on their fee