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How and Why We Sleep? It's apparent that everyone needs to sleep.However,most people vary think about how and why they sleep.We know that if we sleep well,we felt rested.If we don't sleep enough,we often felt tired and irritable.It seems there are tw

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In science, a theory is a reasonable explanation of observed events that are related. A theory often involves an imaginary model that helps scientists picture the way an observed event could be produc

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In science, a theory is a reasonable explanation of observed events that are related. A theory often involves an imaginary model that helps scientists picture the way an observed event could be produced. A good example of this is found in the kinetic

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27. Scientific Theories In science, a theory is a reasonable explanation of observed events that are related. A theory often involves an imaginary model that helps scientists picture the way an observed event could be produced. A good example of thi

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In science, a theory is a reasonable explanation of observed events that are related. A theory often involves an imaginary model that helps scientists picture the way an observed event could be produc

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This is Scientific Americans' 60-Second Science. Im Steve Mirsky. Got a minute? The search for alternative fuels to gasoline has led to surprising possibilities, for instance, the waste oil for making French fries. But one of the most unusual alterna

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Cancer____ who use___ medicine are no more likely than other cancer patients to stop their___ treatments,____ of an Austrian study show. In fact, the____ who did the study report that patients who used alternative medicines often had good___ skills

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Scientific Theories In science, a theory is a reasonable explanation of observed events that are related. A theory often involves an imaginary model that helps scientists picture the way an observed event could be produced. A good example of this is

学个词 Learn a Word-VOA英语教学 2810 alternative

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