【题目】 2018年国庆节假期，某校组织七年级学生走进河北地质大学地球科学博物馆，在这里，同学们可以了解到宇宙的奥秘、地球的圈层结构、地球的运动和地球的内外动力作用，还可以了解地球演变过程中遗存的各种古生物化石。
据此结合所学知识，完成以下面小题。
【1】地球是人类共同的家园，下列有关地球的说法正确的是（ ）
A.地球是正球体B.地球的平均半径为6378千米
C.哥伦布的环球航行证明地球是圆的D.地球的表面积约为5.1亿平方千米
【2】下列关于地球运动产生的现象，说法正确的是（ ）
A.地球公转时，地轴指向北极星
B.地球公转和自转时方向一致，都是自东向西
C.地球自转时，产生了四季更替
D.地球自转时，产生了昼夜更替现象
【3】考古学家在喜马拉雅山上发现海洋生物化石，这说明了地球曾经发生过什么演变（ ）
A.这里曾经是陆地B.这里曾经是海洋，后来地壳变动，成为高山
C.这里曾经发生地震D.登山者曾改造过这里
【答案】
【1】D
【2】D
【3】B
【解析】
【1】地球是一个赤道略鼓，两极稍扁得不规则的球体，故A不正确；地球的平均半径为6371千米，故B不正确；麦哲伦的环球航行证明地球是圆的，故C不正确； 地球的表面积约为5.1亿平方千米，故D正确。根据题意选D。
【2】地球公转时，地球的北极始终指向北极星附近，故A不正确；地球公转和自转时方向一致，都是自西向东，故B不正确；地球公转时，产生了四季更替，故C不正确；地球自转时，产生了昼夜更替现象，故D正确。根据题意选D。
【3】世界上的地壳是运动的，考古学家在喜马拉雅山上发现海洋生物化石，这说明了这里曾经是海洋，后来地壳变动，成为高山。故选B。
该题考查地球的大小、地球的运动和海陆的变迁。分析解答即可。
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