信息不对称
参考答案：
行为人之间的这种信息占有的不同称为信息不对称。其中要涉及到不同行为人之间发生契约关系，否则就无所谓信息不对称。
Mum is coming. What present _______ for your birthday?
A．you think she has got
B．you think has she got
C．do you think she has got
D．do you think has she got
根据《国境卫生检疫法》的规定，受入境检疫的船舶，必须按照悬挂检疫信号，在卫生检疫机关发给入境检疫证前，不得降下检疫信号。白天入境检疫时，在船舶的明显处悬挂国际通语检疫信号旗：“Q”字旗，表示本船有染疫或染疫嫌疑，请即实施检疫。( )
