扶手、扶手座及各圆钢制杠杆托裂纹或弯角处割伤时应（）
参考答案：更换
下列对分子、原子、离子的认识，正确的是 [ ]
A．分子是保持物质性质的最小粒子
B．原子是最小的粒子，不可再分
C．原子得到或失去电子后形成离子
D．CO2和CO性质的差异主要是由于分子间的间隔不同
根据句意及首字母提示, 补全单词
1. He Pingguo is in Class Seven, and Li Hong is in Class Seven, too. They are in the s__________ class.
2. - How do you spell it?
- E-d __________ G, egg.
3. Bai Lixi is from Wuhan. Her E__________ name is Lily.
4. He is from Japan, but they are good f__________.
5. She is in G__________ Two.
