tpo22
托福tpo22套听力真题文本
been hotter and brighter than the model this would mean that it had lost mass over thecourse offour billion years. Student 全国免费咨询电话： 4000123267 Isthat possible? Professor Actually, theSun is
tpo22听力原文
el predicts. But this would mean that it had lost mass over the course of four billion years. Student Is that possible? Professor Actually, the Sun is constantly losing mass through the solar wind, a