（Ⅰ）若不等式f（x）≤m的解集为﹣1，5，求实数a，m的值；

（Ⅱ）当a=2且0≤t＜2时，解关于x的不等式f（x）+t≥f（x+2）．

①皮肤血管收缩          

②增加皮肤的血流量          

③汗腺分泌增多

④汗液几乎不分泌        

⑤代谢活动增强．

已知实数满足$x^2+\frac{1}{x^2}+x-\frac{1}{x}=4$，则$x-\frac{1}{x}$的值是（　　）．

⑴Where's your mum?

⑵Am I going to have a party?

⑶The balloon is flying away.

⑷The teacher can help me.

start:____            duck:____            soon:____

stay:____           mess:____