宿舍内应保证必要的生活空间，人均使用面积不宜小于（）m²，每间宿舍居住人数不宜超过（）人。

A.2.0，15

B.2.5，16

C.3.0，17

D.3.5，18

If you see someone fall overboard from a ship，you should（）.

A.immediately jump in the water to help the individual

B.call for help and keep the individual in sight

C.run to the radio room to send an emergency message

D.go to the control room for the distress flares