[单选] Different from other piano learners， she could only learn by “hearing” music in the beginning．“The piano is my best friend，” Xiong said． “It brings so much fun to my life and gives me hope．”Xiong is a student at Chengdu Special Education School． Because of her talent for playing the piano， she won many prizes in piano competitions． “I never try to win prizes when learning music，” she said． “Like Beethoven， I just want to show my hope and love for life．”Months ago， a video of Xiong playing the piano in a competition appeared online and over 7 million people watched it． Many of them said they were moved （感动） by Xiong’s optimism．问题What is the meaning of the last word “optimism”