【題目】下圖為“太陽直射點(diǎn)移動緯度變化圖”，讀圖，完成下列問題.

a、當(dāng)太陽直射點(diǎn)由b向c移動時(shí)，下列敘述正確的是( )

A、太陽直射點(diǎn)在南半球

B、太陽直射點(diǎn)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(yùn)動引起太陽直射點(diǎn)從a→b→c→d→e的變化，它的繞轉(zhuǎn)中心是______，周期是______。到圖中______點(diǎn)時(shí)，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(diǎn)移動緯度變化圖”可知，當(dāng)太陽直射點(diǎn)由b向c移動時(shí)，太陽直射點(diǎn)在北半球；太陽直射點(diǎn)正在向南移動；北半球各地晝長夜短；此時(shí)，太陽直射點(diǎn)正在向南移動，南極洲極夜范圍逐日遞減。所以，C項(xiàng)正確。故選：C。

b、地球圍繞太陽的旋轉(zhuǎn)運(yùn)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\(yùn)行到圖中b的位置時(shí)，太陽直射北回歸線，北半球的晝最長、夜最短。

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