题目

Speaking of all the songs he has written, I think this is probably his ____ one. A. better-known       B. well-known  C. best-known D. most-known 答案：C以丙酮、甲醇为原料，以氢氰酸,硫酸为主要试剂合成a―甲基丙烯酸甲酯。