题目内容：

   Probably many of you know the idiom “an eye for an eye and a tooth for a tooth”. But do you believe a tooth for an eye? That’s something a little bit different.

This strange exchange is neither a form of retribution(报应) nor an unexpected gift from the Tooth Fairy --- it’s actually a very generous gift from a young Irishman, Robert McNichol, 23, to his formerly blind father, 57-year-old Bob McNichol.

In 2005, Bob McNichol’s sight was destroyed in an accident when his eyes were doused(溅在……上面)with liquid aluminum(铝). Doctors predicted that he would never be able to see again.

But McNichol never liked to take no for an answer: when he heard about a unique operation called Osteo-Odonto-Keratoprosthesis, he knew he had to give it a shot, even though the success rate was a mere 65 percent.

In the technique, the eye socket(眼窝) is rebuilt and implanted(植入) with a human tooth and part of the jawbone, to provide support for an artificial cornea(角膜). Luckily for McNichol, Robert was willing to sacrifice one of his teeth to help his father regain his sight.

The technique isn’t simple: McNichol’s first stint on the operating table lasted ten hours, with a five hour follow-up session at a later date. But thanks to his son’s gift, he’s already seeing astonishing results.

“Now I have enough sight for me to get around and I can watch television. I have come out from complete darkness.” he told his friends.

1.Bob McNichol lost his sight ____ .

A．after he had an operation on his eyes

B．because of an accident

C．because he met with a serious traffic accident

D．when he was 57 years old

2.The underlined phrase “give it a shot” (in Paragraph 4) probably means “____”.

A．give it a try

B．make a remark

C．fire a gun

D．kick the ball

3.The tooth Bobert donated to his father is used to ____ .

A．make the eye socket look prettier	B．cause his jawbone to function well
C．help his father take in more food	D．support the implanted artificial cornea

4.What would be the best title for the passage?

A．Father and son	B．A unique eye operation
C．A man defeating darkness	D．Blind man sees with aid of son’s tooth