【判断题】Most American children attend kindergarten when they are six years old.
【判断题】Most children attend kindergarten when they are 4 in America.__________
【单选题】______is Australia's second largest city, the cultural and sports center of the country.
【判断题】Most children attend kindergarten at the age of 4 in America.
【判断题】Most children attend kindergarten when they are 4 in America.__________A. √ B. ×
【单选题】DNA指导的RNA聚合酶由数个亚基组成,其核心酶的组成是( )