For the past few years, several companies have tried self-cooling undershirts, wrist-worn cooling plates, and windowless cooling machines as extreme heat waves spread across the world. But so far, none seems quite as practical as the Coolify, a $150 wearable that hangs around your neck.

Torras, the company behind Coolify, says its product is different from those cheap neck fans, even if it looks similar on the surface. That’s largely because of its ceramic (陶瓷的) cooling plate that sits right behind your neck. By running the plate, the device creates a cooling sense. “Basically, a neck fan can sometimes just blow hot air around,” Torras spokesman Jackson Wightman says. “This is genuinely an air conditioner as a result of the cooling plate.”

The Coolify comes in smooth plastic and has circular speaker grilles (格栅) on either side of its horseshoe design, somewhat like a pair of headphones. Look through either grille, and you’ll see a fan that draws in air and pushes it out through the long pair of passages above.

The device runs on a built-in battery that charges via USB-C. Torras says the battery lasts between two hours and eight hours on a charge, depending on which of its three fan speeds (H/M/L) you select.

Spending $150 on this might seem expensive. But the real appeal of a device like Coolify---and of wearable air conditioners (A/C) in general---is that they can spare you from having to turn on the A/C just when one person is feeling hot. The Coolify fulfills that goal, so we could pay for it in the long run.

【小题1】Why did some companies try to make self-cooling machines?

A．Self-cooling machines are easy to carry.	B．Science and technology is developing.
C．Traditional air conditioners are out of date.	D．The globe is becoming hotter and hotter.

【小题2】What makes Coolify different from a neck fan?

A．It uses smooth plastic.	B．It has circular speaker grilles.
C．It adopts a horseshoe design.	D．It adopts ceramic cooling plate.

【小题3】How can you make Coolify run as long as possible on a charge?

A．By charging it for 8 hours.	B．By choosing a built-in battery.
C．By choosing the low fan speed.	D．By using USB-C to offer power for it.

【小题4】What does the author think of the Coolify from the last paragraph?

A．It is the best.	B．It is worth buying.
C．It is expensive.	D．It is better than the A/C.