Analysis of test questions: This question mainly examines students' historical literacy. Some materials emphasize that historical understanding should "stand in an objective position", which can directly exclude A; From the information such as "history is an objective fact, undeniable and undeniable" and objective standpoint, we can know that studying history needs to respect historical facts and reflect real history, and B conforms to the meaning of the question; The expressions of c and d are inconsistent with the meaning of the question, so this question should choose B.