21 (A)Business caused changes (B)Life became convenient (C)Travelling caused casualties (D)Relations became closer

24 What does the last sentence imply? (A)Viewers could combine pain with passion in their lives. (B)Viewers found it difficult to interpret her paintings. (C)As Kahlo transformed her pain into powerful art, viewers could also be transformed. (D)As much as Kahlo's paintings were affected by her pain, viewers could not feel her pain.