题目

Kids will often ignore your requests for them to shut off the TV, start their chores（杂事）, or do their homework as a way to avoid following your directions. Before you know it, you’ve started to sound like a broken record as you repeatedly ask them to do their assignments, clean their room, or take out the trash. Rather than saying, “Do your chores now,” you’ll be more effective if you set a target time for when the chores have to be completed. So instead of arguing about starting chores, just say, “If chores aren’t done by 4 p.m., here are the consequences.” Then it’s u 下列排序正确的是 ①热稳定性：H2O＞HF＞H2S ②原子半径：Na＞Mg＞O ③酸性：H3PO4＞H2SO4＞HClO4 ④结合H+的能力：OH－＞CH4COO－＞Cl－ [　　] A． ①③ B． ②④ C． ①④ D． ②③