A：
B：（-2，+∞）
C：
D：
物质
氨水
苹果汁
牛奶
鸡蛋清
pH
8.5﹣10.5
2.9﹣3.3
6.3﹣6.6
7.6﹣8.0
- Sun Yang is ________a talented swimming player.
-That's right. He did best in Barcelona（巴塞罗那）in August, 2013.
计算．
5×5=____ 3×5=____ 2×5=____ 5×1=____ 5×4=____
4×5=____ 5×2=____ 5×3=____ 1×5=____ 5＋5=____
― My leg is hurt. Can you help me?
― Sorry, I am a vet. I . The doctor help you.
的定义域为（ ）