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【題目】地理觀測是學習地理要掌握的基本技能。長春某中學的地理興趣學習小組每天12:00準時觀測記錄學校旗桿影子的長度,他們發(fā)現不同季節(jié)影子的長度不同,其原因是( )

A.地球自轉B.地球公轉C.地球形狀D.地球大小

【答案】B

【解析】

根據地球繞地軸不停轉動，叫地球自轉。地球自轉的方向是自西向東，自轉的周期是一天。地球自轉產生的現象是晝夜交替、日月星辰東升西落和時間差異。地球公轉的周期是一年，方向是自西向東，公轉的中心是太陽，公轉產生的現象有季節(jié)的變化、晝夜長短的變化、五帶的產生、正午太陽高度的變化等，進行分析解答。

由于地球在自轉的同時，不停圍繞著太陽進行公轉，太陽直射點在南北回歸線之間來回移動，所以季節(jié)不同，旗桿的影長不同。故選：B。

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