问题
选择题
He reads newspapers every day to keep himself _______ about what's going on in the world.
A．inform
B．informing
C．informed
D．being informed
答案
答案：C
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He reads newspapers every day to keep himself _______ about what's going on in the world.
A．inform
B．informing
C．informed
D．being informed
答案：C
（通州24）下表列举了四组待鉴别的物质和对应的鉴别方法，其中合理的是
| 待鉴别的物质 | 鉴别方法 | |
| A | 纯碱和熟石灰 | 加入无色酚酞，观察溶液颜色的变化 |
| B | H2、CO、CO2 | 用燃着的木条检验，观察木条燃烧情况 |
| C | 食盐水和烧碱溶液 | 滴加稀盐酸溶液，观察有无气泡产生 |
| D | 硝酸铵和生石灰 | 加水溶解，用手触摸试管外壁温度的变化 |