题型:选择题 伦敦奥运会即将开幕,兴奋剂问题再次引起大家关注。诺龙是兴奋剂中的一种,其化学式是C18H26O2 。下列关于诺龙的说法正确的是A.诺龙中含有氧分子B.诺龙中碳、氢、氧元素质量比为9:13:1C.一个诺龙分子中含有46个原子D. 查看答案
题型:单项选择题 The Solitary Reaper written by ______ uses rural figures to suggest the timeless mystery of sorrowful humanity and its radiant beauty.A. Samuel Taylor Coleridge B. William WordsworthC. John Keats D. George Gordon Byron 查看答案