53. Why does the author mention the invention of the rock opera?
- A. To illustrate how to tell a story using music.
- B. To present the simplest definition of opera.
- C. To show the relevance of opera and classical music.
- D. To justify the necessity of using orchestras in opera.
答案：C
答案句：A better example for the relevance of opera and classical music can be seen in the invention of the rock opera.
参考译文：歌剧和古典音乐相关性的一个更好的例子可以在摇滚歌剧的发明中看到。
定位线索：题干“mention the invention of the rock opera”→答案句“A better example for the relevance of opera and classical music can be seen in the invention of the rock opera”；文中“A better example for the relevance”对应选项C“To show the relevance of opera and classical music”。
解析：题干问作者为什么提到摇滚歌剧的发明，答案句明确指出“A better example for the relevance of opera and classical music can be seen in the invention of the rock opera”，即为了展示歌剧和古典音乐的相关性，对应选项C。选项A“说明如何用音乐讲故事”是例子本身的内容，不是例子的目的；选项B“给出歌剧最简单的定义”是例子中的细节，不是目的；选项D“证明在歌剧中用管弦乐队的必要性”无中生有。