①h（x）的图象关于原点对称；

②h（x）为偶函数；

③h（x）的最小值为0；

④h（x）在（0，1）上为减函数．

其中正确命题的序号为：____．

A: ____do you make a chicken sandwich?

B:____, put the yogurt on a slice of bread.

A: And then?

B: Cut up an onion and a tomato. Add these____the sandwich.

A: What do you do next?

B:____some lettuce and the chicken slices on the sandwich. Put the relish on the chicken.

A: And ____, put another slice of bread on the top.

B: Yes, you are right.

用所给单词的适当形式或汉语提示填单词。