问题
选择题
The boy went swimming in the deep lake his mother's fears for his safety. [ ]
A. in the face of
B. as a result of
C. regardless of
D. in spite of
答案
答案：C
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The boy went swimming in the deep lake his mother's fears for his safety. [ ]
A. in the face of
B. as a result of
C. regardless of
D. in spite of
答案：C
下列与化学有关的知识的整理，完全正确的一组是
| A 常见物质的鉴别 | B 实验操作的先后顺序 | |
| 硬水和软水--加肥皂水搅拌 纯碱和小苏打--滴加白醋观察有无气泡放出 | 点燃可燃性气体--先验纯后点燃 稀释浓硫酸--先放浓硫酸后放水 | |
| C 化学反应和能量 | D 化学中常见的“三” | |
| 光合作用--光能转变为化学能 干电池--化学能转变为电能 | 构成物质三种粒子--分子、原子、离子 陶瓷、玻璃、橡胶三类物质--都属于无机非金属材料 |
A．A
B．B
C．C
D．D