要减小转弯率的同时增大转弯半径，飞行员应（）.
A.减小坡度和降低空速
B.减小坡度和增加空速
C.增加坡度和增加空速
参考答案：B
气温为23℃时，某河段溶解氧浓度为4.5mg/L，已知该河段属于Ⅱ类水体，如采用单项指数法评价，其指数为( )。(根据《地表水环境质量标准》，Ⅱ类水体溶解氧标准为不小于6mg/L)
A．0.75
B．1.58
C．2.66
D．3.25
句型转换。
1. Can I help you? (同义句)
_______ can I _______ you?
2. How much is the apple? (同义句)
What's the _______ _______ the apple?
3. I like comedies best. (就划线部分提问)
___________________________________?
4. He wants to be a teacher. (就划线部分提问)
5. The price of the shoes is 15 yuan. (同义句)
The _______ _______ 15 yuan.
