21. The main purpose of the passage is to:
Your Answer is
Correct Answer is D
Explanation
The article mainly introduces the painting style and painting experience of the painter Orozco, his love and controversy.
L43-L75 all focus on the influence of his experience in the United States. The last paragraph mentioned that Orozco returned to Mexico for development.
Item A: Error, the text does not compare the two styles.
Item B: Wrong, did not mention Orozco's influence on the Mexican mural movement.
Item C: It is only mentioned in the first paragraph, and cannot be the gist of the full text.