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【题目】学习地球自转时,同学们开展了一系列活动。读图,回答下面小题。

1用灯泡模拟太阳,用地球仪观察昼夜现象,需要选择的是

A. B. C. D.

2演示地球自转,正确的做法是

A. 面向地球仪,自左向右拨动地球仪

B. 将地球仪垂直放在桌面上

C. 地轴的指向有规律的发生变化

D. 移动地球仪沿椭圆轨道做水平运动

3演示结束后,同学们分别绘制了地球自转示意图(如图),其中最合理的是

A. B. C. D.

【答案】

1D

2A

3B

【解析】人们根据地球的大小,按一定的比例缩小成一个模型就成了地球仪,地球自转的方向是自西向东,太阳直射点会在南北回归线之间来回移动。

1用灯泡模拟太阳,用地球仪观察昼夜现象,需要选择的是不透明球体,才能体现昼夜现象,故选D。

2演示地球自转,面向地球仪,自左向右拨动地球仪;将地球仪斜放在桌面上;地轴的指向保持不变;地球仪保持不动,故选A。

3地球在自转时,面向太阳这一面是昼半球,背向太阳这一面是夜半球,昼半球与夜半球的分界线与太阳光垂直,故选B。

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