Answer analysis test analysis: "A journey of a thousand miles begins with a single step" means walking a thousand miles and starting with a single step. Metaphorically, everything starts from scratch, starting from small things, step by step. Have clear goals and plans.

B. Exercise in a tough environment,

D. I am good at managing myself, which has nothing to do with the meaning of the question, so I choose C.

Test center: It is a good way to sharpen your will to start with small things and persevere.

Comments: We investigated how to sharpen our will, and let us know that it is a good way to sharpen our will from small things and perseverance, and the difficulty is average.