问题
选择题
After a few years of hard work, they succeeded __ a way out.
A．in finding
B．in looking for
C．to find
D．to look for
答案
答案：A
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After a few years of hard work, they succeeded __ a way out.
A．in finding
B．in looking for
C．to find
D．to look for
答案：A
欲除去下列物质中少量杂质，其中所用的试剂和方法均正确的是（ ）
| 选项 | 物质 | 杂质 | 试剂和方法 |
| A | CuO | Cu | 盐酸、过滤 |
| B | CaCl2溶液 | HCl | 适量NaOH溶液、蒸发 |
| C | NaCl | KNO3 | 溶解、过滤． |
| D | H2 | HCl（气） | 依次通过NaOH溶液和浓硫酸 |
A．A
B．B
C．C
D．D