题目

配对阅读A. Rose, thank you for asking me to play tennis with you, but I'm afraid I can't. I'm staying with my grandpa the whole day to celebrate（庆祝）his birthday. Maybe another time.B. Simon, I'm sorry I can't go swimming with you on Wednesday afternoon because I have to go to the hospital with my mother. She has a toothache. I hope to join you next Wednesday.C. Alice, thank you very much for asking me to dinner on February 16th.1 would like to come very much, but I have to fly to Tokyo on that day. It's very kind of you to ask me. I hope to see you when I get back in a week.D. Juli4．用实验确定某酸HA是弱电解质．两同学的方案是：无用甲：①称取一定质量的HA配制0.1mol/L的溶液100mL；②用pH试纸测出该溶液的pH，即可证明HA是弱电解质．乙：①用已知物质的量浓度的HA溶液、盐酸，分别配制pH=1的两种酸溶液各100mL；②分别取这两种溶液各10mL，加水稀释为100mL；③各取相同体积的两种稀释液装入两个试管，同时加入纯度相同的锌粒，观察现象，即可证明HA是弱电解质．（1）在两个方案的第①步中，都要用到的定量仪器是100mL容量瓶．（2）用pH试纸测定HA溶液pH的操作方法为将一小块pH试纸放在表面皿上，用玻璃棒蘸取少量待测液，点在pH试纸上，再与标准比色卡对照．（3）甲方案中，说明HA是弱电解质的理由是测得溶液的pH＞1（选填＞、＜、=）．（4）乙方案中，说明HA是弱电解质的现象是b（选填编号）．（a）装HCl溶液的试管中放出H2的速率快；（b）装HA溶液的试管中放出H2的速率快；（c）两个试管中产生气体速率一样快．