A.I. Explanation:

Option 1: "differences between ordinary fiction and science fiction."

Explanation: This option suggests a focus on comparing ordinary fiction with science fiction. However, the text does not explicitly discuss differences; instead, it emphasizes the immersive experience of reading science fiction and fantasy. The passage highlights how these genres allow readers to explore various imaginative worlds, rather than focusing on a comparative analysis.

Option 2: "different types of information on science fiction."

Explanation: This option accurately reflects the main idea of the passage, which introduces a radio show that provides various insights into science fiction and fantasy. The text mentions offering 'some basic background' and 'solid recommendations from experts,' indicating that the show will cover a range of information related to these genres.

Option 3: "background information of famous science works."

Explanation: While the passage mentions providing background information, it does not specify that it will focus solely on famous science works. Instead, it discusses a broader range of topics related to science fiction and fantasy, making this option too narrow and not fully representative of the content.

Option 4: "professional opinions about science fiction."

Explanation: This option implies that the show will primarily feature expert opinions. Although the text mentions recommendations from experts, it does not indicate that the show will focus on professional opinions alone. The passage emphasizes a variety of information and insights, making this option incomplete.