【单选题】It turned out that he had forgotten to ______ the lens cap and all the pictures he had taken thus failed to develop.
【简答题】撤销基本表Score的SQL语句是____________。
【判断题】The shell of lychee ranges from brown to pink.
【单选题】When he knew that he had passed the exam, he felt a great weight ______ off his mind.
【单选题】下列哪项混合性酸碱平衡紊乱不可能出现:( )