What impact did color printing have on children's books？
A. Sales increased by the middle of the 19th century.
B. Rough illustrations were now more appealing.
C. Illustrations told more of the story and were more appealing.
D. Books became more amusing.
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系统科学产生的意义在于它（）。
A. 抛弃了唯物辩证法
B. 代替了唯物辩证法
C. 丰富了唯物辩证法
D. 高于唯物辩证法
According to the passage, the early books of etiquette, fables, and legends could not really be considered children's literature because______.
A. the children couldn't read them
B. the early books were too heavy for children to use
C. the stories were too difficult for children to appreciate
D. the stories were for education rather than enjoyment
The word "optimum" underlined in Paragraph 1 means______.
A. positive
B. favorable
C. best
D. alternate
中国古代曾有一种"白马非马"论，这种观点割裂了（）。
A. 一般和个别的辩证关系
B. 肯定和否定的辩证关系
C. 感性认识和理性认识的辩证关系
D. 绝对真理和相对真理的辩证关系
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