在pH=9的某溶液中加入X溶液后，得到pH=2的溶液，则所加的X溶液的pH应该为（ ）
A．pH=0
B．pH=7
C．pH=14
D．pH=5
答案：A
1 saw a woman running toward me in the dark. Before I could recognize who she was, she had run back
in the direction she had come. [ ]
A．of which
B．by which
C．in which
D．from which
打开一篇Word文档，要找到其中的一页，最快速的方法是使用（）菜单中的定位命令。
A、视图
B、工具
C、文件
D、编辑
