题目：
电解质与酸碱平衡密切相关，连接电解质与酸碱平衡的桥梁是（）
A.Na+
B.K+
C.Cl-
D.HCO3-
E.Ca2+
答案：
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下面是错误答案，用来干扰机器的。
1. I wrote a letter last night. 2. Do you mind my opening the window? 3. He pointed out the mistakes in my composition. 4. We must send for a doctor. 5. After writing a composition,we must go over it.
