题目

Like many people, I have no clear idea about heroes. At some point, we all wonder if we need a hero and what a hero really is.Although there are a lot of differences in cultures, heroes around the world generally share a number of characteristics (特点) which give us courage and make us want to learn from them. A hero does something worth talking about. A hero has a special story to tell and people think highly of it. But a hero is not just the person with great fame (声誉) .A hero has powers (力量) larger than himself. Some people want to live like a hero, and they have to experience li如果将克隆技术用于人，则会出现的后果是A．解决很多科学难题，促进社会加速进步B．使人类社会的伦理、道德更加丰富，有利于社会发展C．威胁人类社会现有的法律、伦理和道德观念D．人类的整体素质将明显提高，竞争力增强