诊断疾病的步骤包括搜集资料、分析综合资料及形成印象、验证或修正诊断3个步骤。
参考答案：对
— What do you usually do in your spare time, playing the violin or the piano?
— I do ______ of them. I practice singing with some volunteers. [ ]
A.either
B.both
C.all
D.neither
半熟料栽培
