57. What would be the best title for the text? (A) Composer: a man of mystery (B) Practice makes good music (C) Relation between sleeping and music (D) Music: product of nature

53. The biggest difficulty in operating on the damaged brain is that _______. (A) the time is too short for doctors (B) the patients are often too nervous (C) the damage is extremely hard to fix (D) the blood-cooling machine might break down