问题
单项选择题
There are more ( ) in the board.
A．woman directors
B．woman as director
C．women directors
D．women director
答案
参考答案：C
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There are more ( ) in the board.
A．woman directors
B．woman as director
C．women directors
D．women director
参考答案：C
下列除去杂质的方法正确的是（ ）
| 选项 | 物质 | 杂质 | 除杂方法 |
| A | CaCO3 | KCl | 加热（或高温灼烧） |
| B | Na2SO4 | CuSO4 | 溶解后加适量KOH溶液，过滤 |
| C | KCl | KOH | 溶解后加适量盐酸，蒸发 |
| D | 炭粉 | CuO | 加适量水，搅拌，过滤 |
A．A
B．B
C．C
D．D