题目内容：

    Many of us have reached in our pockets, feeling a vibration (振动), wrongly believing our mobile phones have just rung. The phenomenon even has a name: ‘phantom (幻觉的) vibration syndrome’—and found it is surprisingly common.

Now scientists believe that we are so alert (警觉) for phone calls and messages we are misinterpreting slight muscle spasms (痉挛）as proof of a call. Robert Rosenberger, an assistant professor at the Georgia Tech Institute of Technology has studied the delusional calls. He said sufferers describe a vague tingling feeling which they think is their mobile phone indicating it has received a text message or call while on ‘silent’. But when the device is retrieved, there was no one on the other end.

Dr. Rosenberger said he found so many people say, “This happens to me, but I thought I was the only one. I thought I was odd.” It seems that the syndrome particularly affects people at the beck and call of mobile phones or pagers. A 2010 study by Michael Rothberg and colleagues found that nearly 70 per cent of doctors at a hospital in Massachusetts suffered phantom vibrations. A more recent study of US college students found the figure was as high as 90 per cent.

While the odd feeling is widespread, it does not seem to be considered a grave problem. Dr. Rosenberger said: “It’s not actually a syndrome in a technical sense. That’s just the name that’s got stuck to it.” He added,” Only 2 per cent of people consider it a problem.”

While this phenomenon is widespread, the scientific community has not yet invested much effort in getting to the bottom of why we suffer phantom calls.

Dr. Rosenberger said: “People are guessing it has something to do with nervous energy. The cognitive（认知的）scientists are talking about brain chemistry, cognitive pathways changing. But it’s not like they have brain scans to go on.” He said: “We have a phone call in our pocket all the time and it becomes sort of an extension of ourselves. We have this sort of readiness to experience a call. We feel something and we think, OK, that could be a call.”

1.Why do some people mistake slight muscle spasms for a call?

A. They all have a vivid imagination.

B. They are sensitive to calls and messages.

C. There are few calls and messages in their life.

D. Slight muscle spasms affect them more than other people.

2.Which of the following are more likely to have phantom vibration syndrome than others?

A. Doctors. B. University professors.

C. College students. D. The cognitive scientists.

3.In Dr. Rosenberger’s opinion, phantom vibration syndrome       .

A. isn’t a kind of disease actually

B. is considered a problem by most people

C. is a serious problem ignored by people

D. has something to do with brain chemistry

4.What does the text mainly talk about?

A. Most people have phantom vibration syndrome.

B. How to keep away from phantom vibration syndrome.

C. How to reduce phantom phone vibrations.

D. People care too much about phantom phone vibrations.