If somebody has ________ first-degree burn, give him or her ________ first aid by placing a cool, and wet cloth on it.

A．the;不填

B．the; the

C．a; the

D．a;不填

遇险地址来不及编辑，发射信号中地址用（）。

A、5个01字符表示

B、5个99字符表示

C、4个8表示

D、9个9表示