下部操作调剂的目的是什么？
参考答案：
在于保证高炉合理的初始煤气分布，活跃而均匀的炉缸工作，充沛而稳定的炉温，为充分发挥“风”的作用创造条件。
根据问句或答语提示，完成下列对话。
1. — How's _____ _____?
— Pretty good!
2. — How's _____ _____ today?
— It's raining.
3. — Is it snowing now?
— _____, it's sunny.
4. — Look! He _____ eating _____.
— Yes, he eats dinner at six o'clock every day.
5. — Is Bob watching TV?
— No, he is _____ _____. He plays basketball very well.
一条鱼头长6厘米，尾长等于头长加半个身长，身长为头长加尾长，鱼全长共多少厘米( )
A．48
B．42
C．36
D．30
