in a lab，though: they're identical twins (同卵双生)，created naturally.

　　How does one go about making an exact genetic copy of an organism? There are a couple of ways to do this: artificial(人工) embryo twinning and somatic cell nuclear transfer(体细胞核移植)．Artificial embryo twinning is the relatively low­tech version of cloning.Somatic cell nuclear transfer，(SCNT) uses a different approach compared with artificial embryo twinning.This was the method used to create Dolly the sheep.

　　Let's say you really want a clone to do your homework.Knowing what you know，do you think this approach would really help you finish your homework...this decade?

　　A common misconception is that a clone，if created，would magically appear at the same age as the original.This simply isn't true.You remember that cloning is an alternative way to create an embryo，not a full­grown individual.Therefore，that embryo，once created，must develop exactly the same way as an embryo created by fertilizing an egg cell with a sperm cell (精子)．This will require a surrogate mother and enough time for the cloned embryo to grow and fully develop into an individual.

　　Are you familiar with the phrase "nature versus nurture"？ Basically，this means that while genetics can help determine personality，environmental influences have a considerable impact on shaping an individual's physical appearance and personality.For example，do you know any identical twins? They are genetically the same，but do they really look and act exactly alike?

　　When we hear of cloning successes，we learn about only the few attempts that worked.What we don't see are the many，many cloning experiments that failed! And even in the successful clones，problems tend to arise later，during the animal's development to adulthood.

　　Cloning animals shows us what might happen if we try to clone humans.What have these animals taught us about the risks of cloning?

1．The underlined word "misconception" in Paragraph 6 probably means "________"．

A．belief　　　　　　　 B．misunderstanding

C．explanation D．experience

B　解析：词义猜测题。根据上下文可知，人们往往会认为克隆就是马上能有一个一模一样的你出现，这显然是"误解"。

2．Which of the following is NOT mentioned in the passage?

A．The risks of cloning.

B．The myths of cloning.

C．The definition of cloning.

D．Some issues in cloning.

D　解析：细节理解题。最后两段说的是A项的内容，倒数第四段说的是B项的内容，第二段说的是C项的内容，只有D项的内容没有提及。