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  3. Arthritis (关节炎) does not usually develop in a sheep until it is 10 or 11 years old. But it has recendy been revealed that 5-year

Arthritis (关节炎) does not usually develop in a sheep until it is 10 or 11 years old. But it has recendy been revealed that 5-year

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问题     Arthritis (关节炎) does not usually develop in a sheep until it is 10 or 11 years old. But it has recendy been revealed that 5-year-old Dolly, the world’s first cloned animal, has arthritis in her left hind (后面的) leg. Scientists believe Dolly may have hurt her leg jumping over a gate and then developed arthritis. But they have also wondered whether or not the cloning process led to Dolly’s problem. And, if so, whether or not cloning will always breed unhealthy animals.
    "This is the real story of cloning," says Joyce D’silva, director of Compassion in World Farming. "I think of the hundreds and hundreds of other cloned lambs who have been born and had badly formed hearts, lungs or kidneys (肾). "
    Ian Wilmut, a professor at the Roslin Institute in Scodand, believes that there needs to be an assessment of the health of cloned animals. And he also agrees that scientists might be too commercially motivated.
    However, he added: " Cloning is very young. It has great potential, but we do need to be careful. "
    Dolly was bom in a Scottish research centre in 1996. When Roslin Institute scientists finally announced her birth on February 23, 1997, the news made front-page headlines around the world.
    Other than her arthritis, Dolly remains a healthy animal who has given birth to six lambs.
    Wilmut says that Dolly is being treated with drugs. She is responding well and her condition is being closely watched. There are now hundreds of animal clones, including cows, pigs, mice and goats, many of them appearing to be healthy.
    Just two weeks ago, cloning scientists from the US and Europe announced the birth of cloned pigs that may be suitable for animal-to-human organ transplants. This could lead to a greater supply of organs to help patients on transplant waiting lists. But since Dolly is the oldest cloned animal, no one knows what could happen to the others in the future.
What caused Dolly’s arthritis?
选项 A、Hurt when jumping over a gate.
B、The cloning process.
C、Drugs.
D、Still uncertain.
答案D
解析 对于多利的关节炎的原因，A、B选项都有可能，因此选D不确定，C选项原文没有提到。
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