11. The main purpose of the passage is to:

Answer and Explanation

Your Answer is

Correct Answer is A

Explanation

From the title of this article "mad about shells", we can see the main idea of ​​this article: people's crazy love for shells from ancient times to the present, the origin, impact, and irrationality of this madness (the last paragraph). Among these European countries, France and the Netherlands are the most fanatical about shells.