题目内容：

    When Denis wants to relax at work, he steps into a quiet room, sits in a chair, slips on a virtual-reality headset, and escapes to the beach. For Denis, those minutes are a tool he relies on regularly to both relieve and prevent stress.

He's not the only one at his company to use the room, where workers can also use a headset to watch a moon walk, take a virtual roller-coaster ride or access a meditation (冥想) app.

Research shows VR can help reduce pain and anxiety. But it's not yet clear why it works. Experts believe it's related to the technology's power to distract.

''Whatever their problems are, whatever their stresses are, they can literally neglect them and have a different emotional pulse, '' Denis said.

Virtual-reality headsets haven't taken off with consumers, but they're now powerful and inexpensive enough for companies to consider investing in them to help make workers and customers happier.

The headsets may help people take a virtual break from their surroundings, but there are challenges to consider. Ramon Llamas, a tech market researcher, noted that there could be challenges in handing out headsets. Some people get sick or dizzy while using virtual reality, and the headsets may get dirty or broken. There's also the task of quickly familiarizing people with using the headsets, especially since VR adoption has been so limited and the ways they are controlled can vary.

For now, Llamas said, he's concerned about privacy and security. What if, for instance, someone manages to back into a headset and insert some content into what you're watching?

Another potential issue is the managing of the headsets and software that goes along with them. This is likely not a complication for an office like Umber Realty's, where people can simply take a headset off if they feel something wrong. But it could be more of a problem if you're stuck in a dentist's chair. ''The last thing you want is that in the middle of extracting a tooth something goes wrong.'' Llamas said.

1.What does Denis's company use Virtual Reality for?

A.Improving the customers' experience.

B.Displaying the schedule of his company.

C.Relieving the staff's work pressure.

D.Saving the trouble of transportation.

2.How can the VR devices help the users by Denis?

A.Ignoring reality for the moment. B.Improving their thinking.

C.Designing work for the company. D.Investing in a new industry.

3.What does the author focus on in the last three paragraphs?

A.The potential problems with VR.

B.The privacy policy available for VR.

C.The management of these devices in the market.

D.The standards the VR technology is to follow.

4.What is the best title of the passage?

A.VR, a promising business in future! B.Is VR always making us relax?

C.The adoption of VR needs investments. D.Are we saying ''goodbye'' to VR?