[单项选择]"I’ve never met a human worth cloning," says cloning expert Mark Westhusin from the cramped confines of 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 calves and expect to clone a cat soon. They just might succeed in cloning Missy later this year--or perhaps not for another five years. It seems the reproductive system of man’s best friend is one of the mysteries of modem science.
Westhusin’s experience with cloning animals leaves him vexed by all this talk of human cloning. In three years of work on the Missyplicity project, using hundreds upon hundreds of canine eggs, the A&M team has produced only a dozen or so embryos carrying Missy’s DNA. None have survived the transfer to a surrogate mother. The wastage of eggs and the many spontaneously aborted fetuse
A. Animal cloning is a stupid attempt.
B. Human cloning is not yet close to getting it worked out.
C. Cloning is too inefficient and should be stopped.
D. Animals cloning yes, and human cloning at least not now.

[单项选择]"I’ve never met a human worth cloning," says cloning expert Mark Westhusin from the cramped confines of 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 calves and expect to clone a cat soon. They just might succeed in cloning Missy later this year--or perhaps not for another five years. It seems the reproductive system of man’s best friend is one of the mysteries of modem science.
Westhusin’s experience with cloning animals leaves him vexed by all this talk of human cloning. In three years of work on the Missyplicity project, using hundreds upon hundreds of canine eggs, the A&M team has produced only a dozen or so embryos carrying Missy’s DNA. None have survived the transfer to a surrogate mother. The wastage of eggs and the many spontaneously aborted fetuse
A. there isn’t enough fund to support the research.
B. cloning dogs is more complicated than cloning cats and bulls.
C. Mr. Westhusin is too busy taking care of the business.
D. the owner is asking for an exact copy of his pet.

[单项选择] "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 of eggs and the many spontaneously aborted fetuses (胎) may be accep
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