Analysis of test questions: patriotism is the core of national spirit, and the reasons expressed in the options should be consistent with patriotism. Item A reflects strength and self-improvement, which does not meet the requirements. Item B "Serving the country" reflects patriotism and conforms to the meaning of the question. The famous saying in item C also belongs to self-improvement and does not conform to the meaning of the question. The reason shown in item d is to attach importance to talents, which is inconsistent with the meaning of the question.