四六级

　　自2016年起，英语四级听力改革，将考试题型改为：3篇短新闻、2篇长对话和3篇短文。小编将为大家提供新题型的模拟练习题，这是四级听力在线听练习题第8套短文3，希望能更好地帮助大家进行2017年6月英语四级备考。

四级听力在线听练习题第8套短文3.mp3

　　Questions 23 to 25 are based on the passage you have just heard.

　　23

　　A.They can grow in labs.

　　B.They can form different organs.

　　C.They have resistance against drugs.

　　D.They are newly found.

　　24

　　A.Have a very good rest.

　　B.Forget about the operation.

　　C.Be aware of the rejection.

　　D.Take drugs regularly.

　　25

　　A.People are still unknown about stem cells.

　　B.People feel it is against their religious belief.

　　C.The cost of developing stem cells is too high.

　　D.It puts babies' lives in great danger.

　　Passage Three

　　Some people are calling it the greatest medical breakthrough so far this century. Surgeons in Spain have successfully carried out the world's first organ transplant using new stem cell technology.

　　But what are stem cells? Most cells in our bodies are designed to serve specific purposes—for example, a liver cell develops to work in the liver and cannot become a heart cell. But stem cells are different. (23) They are very young, and in the laboratory scientists can grow them into different types of cell. (24) Currently, transplant patients have to take drugs for the rest of their lives to prevent their bodies rejecting the new organs. These drugs can have bad side-effects, and do not always prevent rejection. But by using Ms Castillo's own cells, doctors were able to trick her body into thinking the new part was her own organ. Five months on, Claudia Castillo is in perfect health. This ground-breaking procedure could be used in other transplant operations in the future. Scientists also believe stem cells might be used to treat Parkinson's disease, Alzheimer's disease, heart disease, stroke, and burns.

　　However, stem cell research is extremely controversial. The most effective stem cells do not come from adults but from embryos created in laboratories and which are just a few days old. (25) Many people have religious or ethical objections to growing embryos, even if they can be used to cure diseases.

　　23. What makes stem cells so special?

　　24. What must organ transplant patients do after the operation?

　　25. Why do some people disagree with the use of stem cells in disease treatment?

　　参考答案：

　　【小题23】B

　　【小题24】D

　　【小题25】B

　　习题解析：

　　【小题23】短文中提到 They are very young, and in the laboratory scientists can grow them into different types of cell.由此可知，干细胞可以发展成为各种不同的器官。因此答案为选项 B。

　　【小题24】短文中指出 Currently, transplant patients have to take drugs for the rest of their lives to prevent their bodies rejecting the new organs. 由此可知，为了避免排斥反应，病人必须终生按时服药。因此答案为选项 D。

　　【小题25】此题针对人们反对使用干细胞的原因进行提问。短文中说 Many people have religious or ethical objections to growing embryos, even if they can be used to cure diseases.由此可知，宗教和伦理方面的考虑促使一些人反对干细胞的使用。因此答案为选项 B。

　　以上就是四级听力在线听练习题第8套短文3的全部内容，希望大家勤加练习，预祝大家顺利通关2017年6月英语四级考试！

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