题目

解释下列物质性质的变化规律与物质结构间的因果关系时与键能无关的变化规律是（   ） ①HF、HCl、HBr、HI的热稳定性依次减弱         ②NH3易液化 ③F2、Cl2、Br2、I2的熔、沸点逐渐升高            ④H2S的熔、沸点小于H2O的熔、沸点 ⑤NaF、NaCl、NaBr、NaI的熔点依次减低 A. ①③④              B. ③④                C. ②③④              D. 全部 Write a passage of at least 60 words according to the given situation. 情景提示：在本学期居家学习期间，你是如何开展学习的？有什么收获？请结合你的学习经历和体验谈一谈。（除诗歌外文体不限。）Expressions for references:take online courses, watch video lectures, organize Wechat groups, share the experiencefollow the advice, the self-learning ability ________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________