题目

_________, you should read the passage and grasp the main idea. Then, if there are too many new words, try to _________ your dictionary. A . To start with; refer to B . To make a scene; look into C . To start with; look into D . To make a scene; refer to 答案：A 已知关于x的方程2x+a-5=0的解是x=2，则a的值为          .