⑴Mom and Dad are the most important people in your life. They have been looking after you since you were born. ⑵你应该一直爱他们。You should also get on well with them. But some children don't know how to do this. Here are some ways to help you. Spend more time with your parents. ⑶Don't spend too much time playing computer games or watching TV. Ask your parents to play with you. ⑷和他们交谈或者散步。 Be kind to your parents. You can make them happy with a smile when you come home. You can send your mother a card on Mother's Day or tell your father a joke on his birthday. ⑸You can also clean your room by yourself. Work hard. If you do your best in your studies, your parents will be proud of you.

下列关于函数 $y=x^2-6x+10$ 的四个命题：①当 $x=0$ 时， $y$ 有最小值10；② $n$ 为任意实数， $x=3+n$ 时的函数值大于 $x=3-n$ 时的函数值；③若 $n>3$ ，且 $n$ 是整数，当 $n\le x\le n+1$ 时， $y$ 的整数值有 $(2n-4)$ 个；④若函数图象过点 $(a,y_0)$ 和 $(b,y_0+1)$ ，其中 $a>0$ ， $b>0$ ，则 $a<b$ ．其中真命题的序号是（   ）

困扰印度经济发展的根本问题是（   ）