题目

把1 mL pH=5的盐酸稀释至1 L，此时溶液的pH是（    ） A.6—7之间       B.7—8之间           C.8                    D.7 答案：A 解析:若按公式计算，pH＞7，但酸性溶液无论稀释多少倍，其酸性不会改变，只是pH无限接近7，而绝不会稀释成碱性溶液。听下面一段材料，回答第1-2题。  1. From the conversation we learn that the man _____.A. likes animals B. wants to take a nap C. can hear nothing2. According to the woman where may the noises come from? A. The flapping wings of a butterfly. B. A group of running ants. C. The leaves of the trees.