听录音,选答语。 ( ) 1. A. This is my seat. ( ) 2. A. All right. ( ) 3. A. It's green. ( ) 4. A. I can see eight books. ( ) 5. A. It's heavy. B. It's near the door. B. It's nice. B. Sure. Here you are. B. I have eight books. B. Two pens and four pencils.
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【简答题】指数函数 y=a x ( a >0 ,且 a ≠ 1 )的图象经过点 (3 , ) ,则函数的解析式是 .