【題目】圖為太陽直射點移動緯度變化圖,讀圖,完成下列問題.

a、當(dāng)太陽直射點由b向c移動時,下列敘述正確的是( )

A、太陽直射點在南半球

B、太陽直射點正在向北移動

C、北半球各地晝長夜短

D、南極洲極夜范圍逐日遞增

b、地球的______運動引起太陽直射點從a→b→c→d→e的變化,它的繞轉(zhuǎn)中心是______,周期是______。到圖中______點時,平頂山市的晝最長、夜最短。

【答案】a、C;b、公轉(zhuǎn) 太陽 一年 b

【解析】

試題分析:a、讀太陽直射點移動緯度變化圖可知,當(dāng)太陽直射點由b向c移動時,太陽直射點在北半球;太陽直射點正在向南移動;北半球各地晝長夜短;此時,太陽直射點正在向南移動,南極洲極夜范圍逐日遞減。所以,C項正確。故選:C。

b、地球圍繞太陽的旋轉(zhuǎn)運動叫做地球的公轉(zhuǎn)。它的繞轉(zhuǎn)中心是太陽,方向是自西向東,周期是一年。當(dāng)?shù)厍蜻\行到圖中b的位置時,太陽直射北回歸線,北半球的晝最長、夜最短。

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