单项选择题In class is syntactically a(n)__________construction.
单项选择题The author's definition suggests that all science fiction deals with_________
单项选择题Which of the following does not usually contribute to the theme in a piece of science fiction
单项选择题One implication of the final sentence in the passage is that_________
单项选择题Science fiction is called a literary sub-genre because__________.