题目

用已知溶质质量分数的溶液可以测定未知溶液的质量分数，实验室有一瓶标签模糊的稀盐酸，某同学为了测定其溶质质量分数，进行了如下实验． ①取一洁净的锥形瓶称量，然后往其中加入一定量的稀盐酸，并滴入几滴紫色石蕊试液（质量忽略不计），重新称量）； ②往上述锥形瓶中逐滴加入溶质质量分数为16%的氢氧化钠溶液，边滴加边振荡，当观察到溶液由红色恰好变为紫色时，停止滴加，再次称量，数据如下表：  锥形瓶锥形瓶+稀盐酸锥形瓶+阅读理解诶。     My first reaction was annoyance. It was Friday afternoon, and I was within an hour of finishing my work for the week. As I was leaving, a nurse brought me one more patient message. The statement read:"Mm. Jones called to say that she has had blurred vision (视觉模糊) ever since her medical test this morning." I smiled. Suddenly our tests were causing eye problems.      This week my patients had questioned everything. My patient with high blood pressure had stopped coming to her treatment on the advice of an Internet chat room. A woman who had a mental problem was substituting ( 用......代替) St. John's word for her medication. Now Mrs. Jones was imagining problems. I rolled my eyes.      My second reaction was worry. As I looked through her record, I tried to figure out why she would have blurred vision, but nothing in her record explained the new problem. She' s probably just anxious, I thought.Still, she wouldn't have called if she had been all right. I picked up the phone.      What I next felt can only be described as delight. Before I made the call, the nurse ran in: Mrs. Jones called.Her vision is fine. Turns out she picked up the wrong glasses when she left the office. The X-ray technician has been having the same problem. I let out a laugh. Mrs. Jones had been right. Her vision had been blurred. Now we know why.      Finally I felt shame. I came to realize what Mrs. Jones had taught me. I had first known she was wrong,that her anxiety had clouded her judgment. Instead, my medical training had clouded mine. Now I feel thankfulthat Mrs. Jones figured it out before I made a mistake about our relationship. Patients come to me for my help. They pay me to listen, diagnose (诊断), treat and talk. That suggests trust; I must remember that, and trustthem too. 1. The writer smiled while reading the patient message because he knew _____. A. Mrs. Jones would ask for more tests B. the patient was being unreasonableC. the nurse was joking with him D. Mrs. Jones would call him 2. What has caused Mrs. Jones' eye problem? A. Wrong glasses. B. Medical checkup. C. Her own imagination. D. Chatting on the Internet. 3. The underlined words "clouded her judgment" in the last paragraph probably mean _____.  A. made her less trustful toward the doctor B. put her in control of her own feelings C. made her less able to think clearly D. put her in a dangerous situation