已知函数f(x)是定义在R上的奇函数，且f(x-4)=-f(x)，在0，2上f(x)是增函数，则下列结论：①若0<x₁<x₂<4且x₁+x₂=4，则f(x₁)+f(x₂)>0；②若
0<x₁<x₂<4且x₁+x₂=5,则f(x₁)>f(x₂),③若方程f(x)=m在-8，8内恰有四个不同的角x₁,x₂,x₃,x₄，则x₁+x₂+x₃+x₄=$\pm 8$，其中正确的有  （   ）

我们在学习历史的过程中，必须清楚哪些是史实，哪些是结论。下列属于“结论”的是（     ）

As we know, Chongqing has changed a lot. Most of the people feel much safer now. More and more trees are being planted in the city. And every day you can see many old people play sports everywhere. The change makes the people in the city live a happy life. The small survey below is from the people who live in Chongqing. One hundred persons were chosen to answer the questions last week.