【单选题】. _________ is good for you going to bed early and getting up early.
【判断题】肝功能不全引起低钾血症的主要原因是醛固酮增加。
【单选题】电阻元件的伏安特性曲线不是一条直线,则该电阻称为( )。
【单选题】You’d better get up early.The early train is ________to leave at five in the morning. [ ]
【简答题】[A] earlier [B] early [C] previously [D] sooner