amenities
2008-12-22 10:07
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- 美国文学
短文：科学理论
科学理论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...
晨读美文055
晨读美文It is commonly believed that only rich middle-aged businessmen suffer from stress. In fact anyone may become ill as a result of stress if they experience a lot of worry over a long peri...
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vegetarian
