划分各级政府财政支出的依据是（）。
A、收支平衡原则
B、财政效益原则
C、财权、事权统一的原则
D、统筹兼顾、保证重点的原则
参考答案：A
The reason ________he told us for his absence was ________ he was knocked down on the way
to school. [ ]
A. why; that
B. why; why
C. which; that
D. which; why
环境温度21左右时，氧气瓶的压力应为（）
A、1500PSI
B、1800PSI
C、2000PSI
