题目内容：

Noise-cancelling audio instruments have been around for a while now，but one Berlin-based designer believes that blocking “visual noise” is as important，if not more so，as cancelling out unwanted sounds．To this end he has created a simple accessory called the Focus Cap．

Open work spaces definitely have their benefits，but they come with the drawback of offering employees little to no control over visual distractions(干扰)．With so many people around and so much going on，some of us can easily get disturbed by this information overload and lose focus in what’s really important．That’s where the Focus Cap comes into play．

“As we are still cavemen or mammals kept in an unnatural environment，I believe that only by reclaiming(收回) the normal，stress-free human state through simple tools and techniques can we finally release our actual creative potential and create our meaningful work for a brighter future，”says German designer Hannes Greblin，inventor of the Focus Cap．

After looking at other products designed at minimizing visual distractions，Greblin decided that most of them were either too expensive or too uncomfortable to become mainstream，so he decided to go with something much simpler —a simple cap with a retractable visor(可伸缩的帽沿)．

Greblin’s Focus Cap is really straightforward．You just wear it like a regular cap’ with the sides of the visor retracted，and just collapse the sides whenever you need to focus on what’s ahead of you．Whether you’re trying to focus on a task in an open work office．Trying to study at university，or practicing yoga in a park and trying to ignore stares from strangers，the Focus Cap can help．

To be honest，this whole project sounds like a joke，but the Focus Cap does have its own website where people interested in this unusual accessory can actually sign up for updates on when it will go on sale．Greblin claims it will cost 30 euros($37)plus shipping．

1.Which of the following can be the best title for the text?

A. When to use the Focus Cap

B. How to operate the Focus Cap

C. The Focus Cap—an ordinary accessory

D. The Focus Cap—a visual-cancelling accessory

2.Why did Greblin create the Focus Cap?

A. To help people focus．    B. To develop intelligence．

C. To make people comfortable．    D. To release creative potential．

3.What do we know about the Focus Cap?

A. It’s expensive．    B. It’s simple．    C. It’s delicate．    D. It’s complex．

4.From the text we can infer that ________．

A. The Focus Cap simply blocks unwanted sounds

B. The Focus Cap can only be used in the office

C. Greblin is confident about the future of his product

D. The Focus Cap has been on sale in quantity