“瓦斯超限作业”是指哪些情形？
参考答案：
⑴瓦斯检查员配备数量不足的；
⑵不按规定检查瓦斯，存在漏检、假检的；
⑶井下瓦斯超限后不采取措施继续作业的。
根据句意和汉语提示，填写单词。
1. His brother is a _____(军人). He joined the army five years ago.
2. We must _____(面对) these problems and find ways to get over them.
3. The old man _____(将……视为) the poor boy as his own son.
4. _____ (除非) we work hard, we will hardly ever learn English well.
5. There is a popular saying in sports meeting, "_____(友谊) first, competition second."
不能跟“正”构成反义关系的是：（）。
A、偏
B、副
C、错
D、负
