有MgCl₂、Al₂（SO₄）₃的混合溶液，向其中不断加入NaOH溶液，得到的沉淀量与加入的NaOH溶液的关系如图所示，则溶液中Cl^﹣与SO₄^2﹣之比为（　　）

下面的坐标曲线表示某种细胞分裂过程中核DNA的变化情况。下列叙述错误的是（  ）

给下列划线的字注音。

樊於期____    而右手揕其胸____     以药淬之____

人不敢与忤视____     为变徵之声____      士皆瞋目____       

阅读理解
    Most of the people in China can have four seasons. However, people in South China have three seasons --- spring, summer and fall. They don't have winters. In north China, people have a cold, dry and windy winter. But people in Kunming only have one season --- spring. It's warm and rainy all the year. You can see green trees and beautiful flowers there. So “ Spring City ”is another name for Kunming.

下列是宜昌市上海中学某化学学习小组在“人吸入的空气和呼出的气体中有什么不同”的探究活动中提出的一些说法，其中错误的是(    )