Human cloning(克隆) technology could be used to reverse heart attacks. Scientists believe that they may be able to treat heart attack victims by cloning their healthy heart cells and injecting them into the areas of the heart that have been damaged, and other problems may be solved if human cloning and its technology are not forbidden.
·With cloning, infertile couples could have children. Current treatments for infertility, in terms of per- (百分比), are not very successful. Couples go through physically and emotionally painful procedures for a small chance of having children. Many couples run out of time and money without successfully having children. Human cloning could make it possible for many more infertile couples to have children than ever be- fore.
·We should be able to clone the bone marrow(骨髓) for children and adults suffering from leukemia (白血病), This is expected to be one of the first benefits to come from cloning technology.
·W
A. the treatment of heart attacks
B. the bearing of babies
C. the cure of blood diseases
D. the detection of gene-related diseases
"I’ve never met a human worth cloning," says cloning expert Mark Westhusin from his lab at Texas A&M University. "It’s a stupid endeavor." That’s an interesting choice of adjective, coming from a man who has spent millions of dollars trying to clone a 13-year-old dog named Missy. So far, he and his team have not succeeded, though they have cloned two cows and expect to clone a cat soon. They just might succeed in cloning Missy this spring -- or perhaps not for another 5 years. It seems the reproductive system of man’s best friend is one of the mysteries of modern science.
Westhusin’s experience with cloning animals leaves him upset by all this talk of human cloning. In three years of work on the Missy project, using hundreds upon hundreds of dog’s eggs, the A&M team has produced only a dozen or so embryos (胚胎) carrying Missy’s DNA. None have survived the transfer to a surrogate (代孕的) mother. The wastage
A. animal cloning is not worth the effort at all
B. animal cloning is absolutely impractical
C. human cloning should be done selectively
D. human cloning is a foolish undertaking
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