(2)The egg nucleus(细胞核) was removed.

　　(3)A cell was taken from the udder(乳房) of a pregnant(怀孕的) sheep.It was “starved”，so that it stopped growing.

　　(4)The two cells were combined into one and then implanted in a third sheep，where it grew normally.

　　(5)The clone was born.It was genetically identical to the pregnant sheep in step (3)．

　　This sounds much easier than it actually was.To end up with one clone，the scientists started with 277 udder cells.And they needed in a way to make the egg cell accept a new nucleus.They did that by starving the cell in step (3)．

　　It may soon be possible to clone many types of animals.Will we also be able to clone human organs，or even whole human beings？We have only begun to think about the morality of cloning technology.Maybe the question to ask is not whether we can clone humans，but instead，should we clone humans?

　　4．Dolly is a sheep

　　because she is grown from a cell of an adult female sheep.

　　A．that has not her father

　　B．that has not her mother

　　C．that has no parents

　　D．that has not any tail

　　答案　C

　　解析　推理判断题。从文中可以看出，多莉是从一只成年羊的细胞中克隆出来的，所以它没有父母，而是那只羊的一个翻版。

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