机械设备、大理石、瓷砖等货物一般采用下列哪种包装形式（）
A.板条、亮格箱
B.麻袋
C.塑料桶
D.捆包状包装
参考答案：A
---What should I do, doctor?
---_____healthy, you should take more exercise.
A．Keep
B．Keeping
C．To keep
D．Having kept
