题目

研究表明，人体能够吸收的是可溶性的钙盐。某补钙品的主要成分为碳酸钙，若每粒钙片含1g碳酸钙，则含钙元素             g（2分），碳酸钙是常见补钙品中钙元素质量分数最高的，但在人体吸收利用的过程中需消耗大量的胃酸，写出有关的化学方程式                              。为了更好地吸收钙元素，胃酸缺乏的人，服用该补钙品的最好时间是在           （填“饭前”、“饭后”、或“饭中”），用文字简述理A: Hi, Sandy. Long time no see.B. Hi, Nick. Yes, I was on vacation last month. A: 【1】?B: I went to Hainan with my family.A: 【2】?B: Yes, I did. I had a good time there.A: I’m very happy you come back. There’s a new movie Lost, Found(《找到你》)now. 【3】?B: On Saturday? I’d love to, but I’m afraid I can’t.A. 【4】?B: I’m going to see my grandparents that day. I bought something special for them when I was on vacation.A: 74.【5】?B: Sunday? Sure, that sounds great.