有明确规章，成员地位和角色、权利和义务都很清楚，并具有稳定、正式编制的群体是指（）。
A.参照群体
B.成员群体
C.非正式群体
D.正式群体
参考答案：D
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
一艘被追越的机动船，应给下列（）种追越船让路。
A.帆船
B.操限船
C.从事捕鱼的船
D.以上均不对
