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Except for the ruffling of waves, and the pull of the tides, you probably think of the ocean as pretty flat. You wouldn't expect it to have a geography, its waters piled up into lasting hills or sunk into valleys. Sea level ought to be pretty level,

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SSS 2008-03-31

This is Scientific American's 60-Second Science, I am Steve Mirsky, got a minute? You are pulling the tape off the roll and it starts to tear, or you are moving wallpaper and it refuses to strip off in strips or in what may be the most infuriating ca

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(Woman) Today I want to talk about the Earth's last major climatic shift, at the end of the last ice age. But first, let's back up a moment and review what we know about climatic change in general. First, we defined climate as consistent patterns of

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JEFFREY BROWN: Finally tonight, new findings and charges in the investigation of the Upper Big Branch Mine disaster in West Virginia. It was the deadliest in the U.S. in four decades29 men were killed on April 5, 2010, after an explosion at the mine

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By Paul Sisco Washington 13 July 2007 NASA scientists have unveiled details of the space agency's plans to pierce the icy surface of Mars, near its north pole. The mission is designed to find evidence of water or life on the red planet. VOA's Paul S

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The Mississippi river remains near-record stayed across West Tennessee，Arkansas and here in Mississippi as well, swamping residencies, farmland and businesses. A lot of these people don't have flood insurance,and they may have nothing left.In prepa

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Kenya Moves Full-Steam Ahead on Geothermal Production Kenya is expanding plans to become one of the worlds top geothermal power producers with the start of explorations at a site called Menengai. The government is also aiming to make geothermal Kenya

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This is Xaero - a vertical take-off and landing vehicle being developed by Masten Space Systems. The California start-up hopes the rocket will eventually carry pay-loads for NASA to altitudes of up to 30 kilometres, mainly to collect atmospheric data

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But today's flight is no rescue mission. 但今次出航的目的不是救援 Its purpose is to deploy me into harsh glacier terrain high up in the Chugach mountains. 而是要把我撂在楚加奇山脉中 严酷的冰川高地上 I plan to rappel.

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The completion of the system, first proposed in 2011, has been announced at a Beijing conference organized by the International Atomic Energy Agency. Liu Hua is the chief engineer of China's National Nuclear Safety Administration. In our central-leve

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In Beijing, CPPCC members have held a news conference on how to preserve the environment and promote green development. They discussed the government's determination to protect the environment, the severity of climate change, and what role the media

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Among many things, water pollution prevention and control was strengthened. The percentage of water rated at level 5 grade, which is the lowest grade, decreased 6.8 percent. Also, daily waste water treatment capacities for cities and towns increased

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NEW YORK, Feb. 14 (Xinhua) -- U.S. stocks closed mixed on Monday as investors were digesting the government's budget proposal for fiscal 2012. U.S. President Barack Obama proposed（提议,计划） a budget on Monday, according to which the deficit

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16.The early railroads were........the existing arteries of transportation: roads,turnpikes, canals,and other waterways. A.those short lines connected B.short lines that connected C.connected by short lines D.short connecting lines 答对率：50% 答案