第4期: hook, vacant, shape, total, change

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Potential energy in a crossbow When we think of the concept of energy, we often think of objects in motion: a car rolling down a hill or a jogger running up a hill. This kind of energy-in-motion, called kinetic energy, isnt the only kind of energy. A

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Gas 气体 There are three different kinds of matter. They are solids, liquids and gases. 物质分三种：固体、液体和气体。 Gas has no shape, so you can't touch gas. 气体本无形，所以你触摸不到。 Gas moves very freely. 气体能

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By Selah Hennessy London 20 October 2009 A global watchdog group says world oil supplies are running low and that may lead to food shortages and spiraling armed conflict. Britain-based Global Witness says governments are doing nothing to prepare for

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How to Create Passion Anywhere and Anytime

How to Create Passion Anywhere and Anytime Remember Science class? Mr. Thatcher, sophomore year in high school, taught us about potential and kinetic energy. I was way more interested in Pam Miller, who sat perilously close to me. But on Mr Thatcher

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台湾籍旅美老师今天交给我们的句子是： But what we now know is that these cues and these rewards that really shape how habits occur and how to change them. 但我们现在知道的是，这些提示和奖赏真的影响了习惯怎么养

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Sit on a swing, let someone push you, and away you go. But what happens if the person who pushed you walks away, and you want to swing faster and higher. If you've ever been in the second grade, you know the solution to that. Just start pumping your