问题
选择题
I noticed my little son ____ the words ____ on his small blackboard. [ ]
A. read; writing
B. reading; writing
C. to read; written
D. read; written
答案
答案：D
搜题请搜索小程序“爱下问搜题”
I noticed my little son ____ the words ____ on his small blackboard. [ ]
A. read; writing
B. reading; writing
C. to read; written
D. read; written
答案：D
今有失去标签的碳酸钠溶液、氯化钡溶液和盐酸，只用一种试剂即可鉴别它们．在已知氯化钡溶液的pH=7，甲、乙、丙三同学分别选取了三种不同的试剂，实验均成功．请根据下表答题：
| 学生 | 甲 | 乙 | 丙 |
| 所用试剂 | 酸溶液 | 钾的正盐 | 酸碱指示剂 |
| 选用试剂的名称 |