问题
选择题
—The skirt looks different from others and it is nice.
—Thanks. It _____ by my mother last month. [ ]
A. made
B. is made
C. was made
答案
答案：C
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—The skirt looks different from others and it is nice.
—Thanks. It _____ by my mother last month. [ ]
A. made
B. is made
C. was made
答案：C
（1）写出下列物质的名称、俗称或化学式．
名称 | 固态二氧化碳 | ② | 氢氧化钠 | 碳酸钠 |
俗名 | ① | 生石灰 | ③ | 纯碱 |
化学式 | CO2 | CaO | NaOH | ④ |
（2）判断下列物质的类别，并用相应的序号填空．
| 物质化学式 | KOH | SO2 | (NH4)2SO4 |
| 物质类别 |