A
There are many ways in which human cloning is expected to benefit humans.
Dr Richard Seed, one of the leading supporters of human cloning technology, suggests that it may someday be possible to completely change the aging process because of what we learn from cloning.
Scientists believe that they may be able to treat heart attack victims by cloning their healthy heart cells and injecting them into the areas of the heart that have been damaged. Heart disease is the number one killer in the US and several other industrialised countries.
There has been a breakthrough with human stem cells. Embryonic stem cells can be grown to produce organs to repair or replace damaged ones. Skin for burn victims, brain cells for the brain damaged, hearts, lungs, and kidneys could be produced. By combining this technology with human cloning technology, it may be possible to produce needed organs for suffering people that will be free of rejection by their immune systems. Conditions such as Alzheimer's disease, Parkinson's disease, heart failure, and other problems can be cured if human cloning and its technology are not banned.
Though current treatments for infertility (不生育) are getting a fair amount of publicity in the news, they, in terms of percentages, are not very successful. Some data shows that current infertility treatments are less than 10 percent successful. Couples go through physically 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 possible.
1．According to Dr Richard Seed, we can use cloning technology to ________.
A．produce more animals
B．make people live happily
C．make people look younger
D．cure people of many diseases
解析：选C 推理判断题。根据第二段中的“to completely change the aging process”可知，Richard Seed认为克隆技术可以彻底改变变老的进程。因此推知，克隆技术可以使人们看上去更年轻。
2．We can learn from the passage that ________.
A．cloning has already been used to treat heart disease
B．we can treat a man's heart disease by cloning hearts
C．most people in industrial countries suffer from heart disease
D．more people die of heart disease than of other diseases in the US
解析：选D 细节理解题。根据第三段最后一句可知，心脏病是美国和其他工业化国家的头号杀手，因此在美国死于心脏病的人要比死于其他疾病的人多。
3．What is the main idea of the last paragraph?
A．With cloning infertile couples could have children.
B．Treatment of infertility is not successful.
C．Infertile couples suffer a lot physically and mentally.
D．It is difficult for couples to have more children now.
解析：选A 段落大意题。联系全文可知，本文的主题是人类克隆技术。最后一段点明了现在治疗不孕的成功率很低，许多夫妇饱受煎熬，最后说明了利用人类克隆技术可以使不孕的夫妇有自己的孩子，因此A项正确。
4．What is the author's attitude towards human cloning?
A．Supportive. B．Doubtful.
C．Cautious. D．Curious.
解析：选A 推理判断题。根据文章第一句，特别是关键词benefit及第二至五段(都是讲人类克隆技术会给人类带来益处)可推知，作者对人类克隆技术持支持的态度。
