2l.C细节理解题。根据About Time:A First Look at Time and Clocks的Long ago people used the sun,the moon,and the water to tell time.可知,孩子们可以在“关于时间”这本书中了解过去计算时间的方法。故选C。22.D推理判断题。根据Animalium:Welcome to the MuseumDiscover the animal kingdom in glorious detail withunique illustrations和Bang!:How We Came to Be中的So begins this beautifully illustrated story of evolution可知,这两本书中都有插图用来描述故事。故选D。23.D细节理解题。根据最后一段Bedtime Math:The Truth Comes Out With over 100 math problems on a variety oftopics,kids will find math isn't just fun一it can be found everywhere可知Bedtime Math可以使数字学习简单有趣。故选D。