用min{a，b，c}表示a，b，c三个数中的最小值．设函数f（x）=min{2
题型：填空题
问题：
用min{a，b，c}表示a，b，c三个数中的最小值．设函数f（x）=min{2x，x+2，10-x}，则函数f（x）的值域为______．
题型：填空题
从下面方框中选择适当的选项补全对话。（5分）（其中有一项是多余的）
A: Excuse me, may I ask you some questions?
B: Certainly.
A: ___小题1:____
B: I eat them every day.
A: Do you like them?
B: ____小题2:___But the doctor says they are good for my health.
A: Do you like junk food?
B: ___小题3:___ But I try to eat it only once a week.
A: Why?
B: ___小题4:___
A: How many hours do you sleep every night?
B: ___小题5:___
A: Oh, I think you must be in good health.