Human cloning technology could be used to reserve heart attacks. Scientists believe that they may be able to treat heart attack 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 percentages, are not very successful. Couples go through physical 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 before.
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. We may learn how to switch cells on and off through cloning and thus be able to cure cancer.
Cloning technology can be used to test for and perhaps cure gene-related diseases. The above is just a few examples of what human cloning technology can do for mankind. This new technology promises unprecedented （前所未有的）advancement in medicine if people will release their fears and let the benefit begin.
小题1:What does the underlined word “infertile” (paragraph 2) most probably mean?
A．with physical and emotional problems
B．short of time and money
C．unable to give birth to children
D．separated from each other for a long time小题2:According to the text, one of the first expected benefits from cloning technology is in ______.
A．the treatment of mental diseases
B．the reserve of heart diseases
C．the cure of gene-related diseases
D．the bearing of babies小题3:According to the writer, the main problem with the development of human cloning technology is that__________.
A．it has brought about benefits so far
B．it may be out of human control
C．people still know little about it
D．people are afraid of such technology
小题1:C
小题2:B
小题3:D
题目分析：文章大意：这篇文章介绍了克隆技术给人类会带来的好处：有治疗疾病，帮助不孕不育的父母，延缓心脏病等，但首先是人们要克服对这项技术的恐惧。
小题1:猜词题：从第二段的句子：With cloning, infertile couples could have children. 可知有了克隆技术不孕不育的父母就可以有孩子了，可知infertile 意思是：unable to give birth to children 选C
小题2:细节题：从第一段的句子：Human cloning technology could be used to reserve heart attacks. 可知克隆技术可以用来延迟心脏病，所以选B
小题3:推理题：从文章的最后一段的句子：This new technology promises unprecedented （前所未有的）advancement in medicine if people will release their fears and let the benefit begin.如果人们消除恐惧这项技术会有医学上前所未有的进步，可以推断出克隆技术发展的主要问题是人们害怕这项技术。所以选D