【单选题】Shakespeare is difficult to understand than contemporary writings because many of his words were used in different ______ from what they have now in dictionaries.
【单选题】Until the ninth century, written words were not actually separated, ____________in some literary writing, dots or points were used to indicate divisions.
【单选题】下列实验的解释或结论不正确的是( ) 选项 实验 解释或结论 A 用激光笔照射水玻璃溶液,有丁达尔现象 SiO 3 2- 水解生成硅酸胶体 B 在新制的氯水中加入碳酸钙粉末,充分搅拌 氯水中HClO的物质的量增加 C 向包有Na 2 O 2 的脱脂棉滴少量水,脱脂棉燃烧 Na 2 O 2 与H 2 O反应放热并有O 2 生成 D 向某溶液中加入稀盐酸,再加入硝酸钡溶液生 成白色沉淀 原溶液中一定...