The largest object in the solar system is the Sun. It contains 99 percent of the _____5_____ of the solar system. At the center of the solar system, the Sun is glowing, not burning. It glows because its temperature is about 10,000 degrees Fahrenheit. This heat is not _____6_____ by burning, but rather by fusion. The nuclear fusion takes _____7_____ deep in the Sun’s core at a temperature of about 15 million degrees. As the heat travels out of the Sun, it becomes much _____8_____ , but still hot enough to glow in visible light. For _____9_____ , the temperature of a wood fire is less than a thousand degrees Fahrenheit. 【題組】8. (A)cooler (B)colder (C)calmer (D)bitter
林翔 國三下 (2013/10/16) 個人想法：從原本很熱的地方出來之後到了外面開始冷卻，但這時候的溫度還是有熱度的(原文章but still hot enough to glow in visible light)cool 指的是 not hot or warmcold 指的是 having a low.....看完整詳解
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