题干

春秋初期,郑庄公一度独揽王室大权。周郑双方互换太子为质,史称“周郑交质”。后来双方反目,郑军打败周军,周桓王中箭负伤,史称“射王中肩”。这段材料实质上反映了(    )

A:春秋争霸战争

B:宗法分封制被破坏

C:郑国变法效果显著

D:统一条件已成熟

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答案(点此获取答案解析)

B

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阅读古诗《观沧海》,完成小题。
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                                                                                                  曹操
                                                                                       东临碣石,以观沧海。

                                                                                       水何澹澹,山岛竦峙。

                                                                                       树木丛生,百草丰茂。

                                                                                       秋风萧瑟,洪波涌起。

                                                                                       日月之行,若出其中;

                                                                                       星汉灿烂,若出其里。

                                                                                       幸甚至哉,歌以咏志。