C.Cloning is of great use for people and animals.
D.The development of cloning.
解析 主旨大意题。由第一段可知。
答案 A
2.Which of the following is TRUE according to the passage?
A.Cloning is mainly used for cloning human beings.
B.In the far future, we will have the live dinosaurs on earth.
C.Cloning human beings may cause a lot of trouble.
D.Genetically human stem cells are used for cloning human beings.
解析 细节理解题。由最后一段最后两句可知。
答案 C
3.The underlined phrase “infertile couples” in the last paragraph probably means________.
A.couples who just married
B.couples who are unable to bear children
C.couples who don't like bearing children
D.couples who want to bear more children
解析 推理判断题。没有生育能力的父母会想到用克隆的方法拥有自己的孩子。
答案 B
4.According to the passage,the reason why people want to clone humans is that________.
A.it can make people live longer
B.it can help infertile couples have children
C.it can replace a deceased child for the couple
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