解析：　推理判断题。从第一段的unlike similar scientists you have seen in the movies，they both have a sense of humor可知电影中的生物工程学家一般都是没有幽默感的。

　　答案：　C

　　6．We can learn from the passage that bio­technology________.

　　A．has been banned in many countries around the world

　　B．is being used to improve one's intelligence right now

　　C．can help improve the physical condition of future generations

　　D．is sure to care any disease in the near future

　　解析：　推理判断题。从第四段的genes can be controlled to help you sleep better and become smarter，healthier，and taller.Well...not exactly you，but future generations可知C项正确。

　　答案：　C

　　7．According to the passage，a clone of you________.

　　A．will want to kill you

　　B．knows whatever you know

　　C．has no belly button

　　D．will be younger than you

　　解析：　细节理解题。从最后一段的who will be considerably younger than you可知D项正确。

　　答案：　D

　　8．The passage was written mainly to________.

　　A．predict the future of cloning

　　B．introduce two bio­engineering experts

　　C．review a book on cloning

　　D．protest against movies about cloning

　　解析：　作者意图题。第一段主要描述了How to Defeat Your Own Clone一书作者的情况和写作风格，第二、三、四段主要介绍了此书的内容并发表了相关感想，最后一段是其他一些感想，由此可见本文的主要目的是记录此书的观后感。

　　答案：　C