题目内容：

How would you like to have been born without any ability to feel pain? There are such people. One of them is being studied by doctors at a hospital in New York City. He is a 22-year-old clerk who really does not know the meaning of pain. But he wishes he did.

Not long ago a packet of matches flared up(骤然烧起) in his hand. Luckily the burn was not serious. It caused large blisters(水泡) but still did not bother him. He said the burn felt like a fly crawling(在……上爬行) on his fingers. It has been the same story as far back as he can remember. He has never had headaches or sore(疼痛的) muscles. Bee stings, cuts and bruises(疼痛的) do not hurt.

Being free from pain is not as wonderful as you may think. The young man has had to have rotted teeth pulled because he never felt toothache warnings. A sudden attack of appendicitis(阑尾炎) could be deadly. Life without pain is as risky as trying to run a cruise ship without fire alarms.

1.In the final sentence, the writer uses “fire alarms” to mean ________.

A. loud noises that a person hears

B. a signal that something is wrong

C. heat warnings

D. the ability to smell smoke

2.The selection as a whole points to the fact that ________.

A. fire can cause serious injuries

B. life is happier without pain

C. teeth can be pulled painlessly

D. pain serves a useful purpose

3.The young man had to have teeth pulled because ________.

A. he did not know his teeth were decaying

B. he did not take care of his teeth properly

C. he did not like to visit the dentist

D. he was born with soft teeth