A

Test question analysis: Some people are good at finding positive aspects in life and maintaining an optimistic attitude; Discover the negative side and become pessimistic and negative. It can be seen that we must maintain an optimistic attitude in order to live a better life. The material in the question "Life is always interesting, even troubles are interesting", which inspires us to maintain an optimistic attitude and always find the positive side in life, so item A is in line with the meaning of the question and can be selected; two items B and C It does not fit the meaning of the question, so it cannot be selected; there are positive and interesting things in life, as well as negative things, so item D is incorrectly stated and cannot be selected. Therefore, the answer is option A.