大于－2.5而小于3.5的整数共有(    )

你知道“年"的故事吗?读句子，标序号。

____ An old man comes to the village．He tells the people in．the village Nian is afraid of the colour red．

____ People use red things and light firecrackers at the Spring Festival every year．

____ Nian is a monster．At the end of every year，he goes into the village and eats people!

____ Nian comes down from the hills．He Sees red paper on the doors and windows．He also sees red firecrackers．

____ People glue red paper on the doors and windows．

____ Nian feels afraid and runs back into the hills．

给出下列命题：

①存在实数α，使sinαcosα=$\frac{\sqrt{3}}{2}$

②函数y=sin($\frac{3}{2}\mathrm{\pi }$-x)是偶函数

③x=$\frac{\mathrm{\pi }}{8}$是函数y=cos(2x+$\frac{3}{4}\mathrm{\pi }$)的一条对称轴方程

④若α、β是第一象限的角，且α＜β，则sinα＜sinβ

其中正确命题的序号是____