托福阅读模拟题：宇宙元素
关于托福考试的阅读提分办法，小编认为除了记忆词汇和积累背景知识外，多做题目也是必不可少的!下面是出国留学网(www.liuxue86.com)托福频道小编为大家带来的托福阅读模拟试题—宇宙元素，希望对大家有所帮助! The elements other than hydrogen and helium exist In such small quantities that it is accurate to say that the universe somewhat more than 25 percent helium by weight and somewhat less than 25 percent hydrogen. Astronomers have measured the abundance of helium throughout our galaxy and in other galaxies as well. Helium has been found In old stars, in relatively young ones, in interstellar gas, and in the distant objects known as quasars... [ 查看全文 ]托福阅读模拟题：宇宙元素的相关文章
