单选题 .  Many people seem to think that science fiction is typified by the Bug-eyed Monster, embodying every feature that most people find repulsive. This is unfortunate because it degrades a worthwhile literary endeavor. Instead, the basic interest of science fiction lies in the relation between man and his technology and between man and the universe. Science fiction is a literature of change and a literature of the future, and the aspects of human life that it considers make it well worth reading and studying for no other literary form does quite the same things. What is science fiction? To begin, the following definition should be helpful: science fiction is a literary subgenre which postulates (以……为前提) a change (for human beings) from conditions as we know them and follows the implications of these changes to a conclusion.
    The first point that science fiction is a literary sub-genre is a very important one, but one which is often overlooked or ignored in most discussions of science fiction. Specifically, science fiction is either a short story or a novel. There are only a few dramas which could be called science fiction, the body of poetry that might be labeled science fiction is only slightly larger. To say that science fiction is a subgenre of prose fiction is to say that it has all the basic characteristics and serves the same basic functions in much the same way as prose fiction in general, that is, it shares a great deal with all other novels.
    Everything that can be said about prose fiction, in general, applies to science fiction. Every piece of science fiction, whether short story or novel, must have a narrator, a story, a plot, the themes of science fiction are concerned with interpreting man's nature and experience in relation to the world around him. Themes in science fiction are constructed and presented in exactly the same ways that themes are dealt with in any other kind of fiction. They are the result to a particular combination of a narrator, story, plot, character, setting, and language. In short, the reasons for reading and enjoying science fiction, and the ways of studying and analyzing it, are basically the same as they would be for any other story or novel.1.  From the first paragraph, we can infer that science fiction is popular because ______.