对于平面直角坐标系中的任意两点P₁（x₁，y₁），P₂（x₂，y₂），我们把|x₁﹣x₂|+|y₁﹣y₂|叫做P₁、P₂两点间的直角距离，记作d（P₁，P₂）．

化简：$\frac{\sqrt{1-2\sin 40°\cos 40°}}{\sin 40°+\cos 140°}$=____ 

A: Hi,John!____I can't even seethe buildings clearly nearby.

B: That's true,The haze is getting worse and worse.____

A: Yes,I did. The haze will continue for a week.

B: What?I'm getting really worried.If the weather stays like this,I won't be able to play sports in the open air.

A:____

B: We really should do something to cut down the air pollution.What can we do?

A:____

B: We can also ride a bike.It's really good for health.

A: You are right. Let's start with small things,____

You'd better stay at home and drink more water

What bad weather!

I believe we'll overcome the haze one day!

How is it going?

We can take buses and subways instead of driving

Did you listen to the weather report for tomorrow?