【单选题】At first, the speaker was referring to the problem of pollution in the country, but halfway in her speech, she suddenly ______ to another subject.
【单选题】1-11.礼是合于( )的行为准则。选择一项:
【判断题】在国际关系中,有永久不变的敌人,也有永久不变的朋友。( )
【判断题】在信息技术教学评价中,电子档案袋式评价,主要是记录学生学习过程及评价结果。