题目

选词填空due to，look into，step up，make up，occur to，show up，take charge of，point out （1） Tom's losing job is his carelessness. （2） It never me that they two got married. （3） An hour after the robbery happened，the police began to the case at once. （4） It's very unkind of you to stories about him. （5） The competition is coming and we must our training to prepare for the race.pH=2的两种一元酸X和Y，体积均为100 mL，稀释过程中pH与溶液体积的关系如下图所示。分别滴加NaOH溶液（c=0.1 mol·L-1）至pH=7，消耗NaOH溶液的体积为Vx、Vy，则（ ）A．x为弱酸，Vx<VyB．x为强酸，Vx>VyC．y为弱酸，Vx<VyD．y为强酸，Vx>Vy