Write an essay of about 80 words entitled Should cloning of human beings be banned? Your essay should cover the following points.
1. Your opinion on cloning of human beings.
2. Give supporting evidence.
3. Use to begin with, secondly, thirdly and finally to connect all the evidence.
Model Paper
Cloning of human beings should not be banned. To begin with, it is probably one of the ways like vitro (体外的) fertilization (授精) to help a couple have a child when they could not have any other way. Secondly, it will advance our knowledge of how genes direct the development of a single cell embryo (胚胎) into a complex adult. Finally, the ethical problems concerning cloning will be solved gradually by human beings.