参考答案：D

解析：[听力原文] 9-13
Scientific discoveries have changed man’s life a great deal during the past century. First of all, they have greatly improved material well-being in several areas of life. In the field of medicine, cures for life threatening diseases have enabled people to live longer. In communication the telephone and email have made it possible for us to communicate with anyone in the world without leaving our homes or offices. Advances in transportation allow businessmen to fly across the ocean in the morning and return home the same evening. Space technology has put men on the moon. More efficient ways of using available resources, such as coal and solar power, have been explored.
Scientific discoveries have also changed man’s moral atmosphere. Ethical issues are raised by these discoveries. Should we keep a terminally ill person alive through drugs and medicines or should we allow him to die in dignity With advances in transportation has come the problem of pollution for nearly every major city in the world. If cities become inhabitable, then such technical advances may come with too great a price to pay. Many people also question the wisdom of sending men to the moon when there are urgent problems that have not been solved on earth. During future years increasing attention must be given to the moral as well as the practical applications of science.