Not long ago , Richard Denniston found himself suffering the same pain that millions of ot

Not long ago , Richard Denniston found himself suffering the same pain that millions of other pet owners have faced . His little Scottish dog had a brain tumor（肿块）and would soon die. Like others who faced the problem before him , Denniston just wanted to end his pet’s suffering . However , he took one step further.
Deniston , an expert who studies animals , collected a tiny skin sample from the dog and took it to his laboratory at Louisiana State University. There he  cultivated  it and froze it in liquid nitrogen.
From that idea , Denniston started a new technology .Denniston’s pany will save pet’s DNA ＄500，plus a monthly storage fee of Us ＄10, until cloning bees a reality .
Thanks mostly to the contribution of a California multimillionaire , that day may not be so far off.
“It could happen extremely soon if everything went on well.”says Mark Westhusin , a professor leading a dog cloning team . Most experts put successful dog cloning a year to five years down the road . The cost is bound to be expensive at first , but it would eventually drop to a few thousand dollars.
Since Dolly , the sheep which was first cloned in 1997 ,cattle ,goats ,mice and monkeys have been cloned in labs . Pets are likely to be next.
“I really believe that the technology is going to bee available for many species in the near future ,”Denniston says .
1. After his pet died ,Richard Denniston    .
A. did something more than the ordinary pet owners
B. did as other pet owners
C. did nothing but feel very sad
D.could not help feeling lonely without his dear pet
2. Richard Denniston    in liquid nitrogen for an experiment.
A. was a doctor who put his dog
B. was an animal expert who put a piece of his dog’s skin
C.was an expert at collecting skin samples who then put them
D.took great interest in freezing things
3. The underlined word “cultivated ”in Para . 2 probably means    .
A. bought     B.discovered    C.caught     D.trained
4. Cloning will cost people    .
A. a lot of money in five years .
B. much in the beginning and then be reduced to a thousand dollars.
C. much and then will surely be reduced to thousands of dollars.
D.much at first and then might be reduced to a few thousand dollars.A