A:稳定性:HF > HCl > HBr > HI
B:碱性:NaOH > Mg(OH)2 > Al(OH)3
C:酸性:H2SO4 > H3PO4 > HClO4
D:氧化性:O2 > S > Se
It takes ________ two hours ________ the English story.
— I feel stressed from time to time. Could you give me some advice?
—__________ sharing your worries with your parents?
读“我国台湾岛沿北回归线地形剖面及沿面线相关要素变化示意图”,完成下题。