【題目】下列節(jié)日中,湖北省恩施市的晝長比夜長短的是(

A. “五一”勞動節(jié)B. “六一”兒童節(jié)C. “八一”建軍節(jié)D. 元旦

【答案】D

【解析】

本題考查了地球公轉(zhuǎn)產(chǎn)生的現(xiàn)象。

恩施位于湖北省西南部,地處北半球。地球繞太陽公轉(zhuǎn)的過程,太陽直射點(diǎn)在南北回歸線之間有規(guī)律的移動。太陽直射點(diǎn)在春分(321日前后)和秋分(923日前后)時直射赤道,此時晝夜平分;當(dāng)太陽直射點(diǎn)在北回歸線時,北半球是夏至日(622日前后),這一天晝最長夜最短;當(dāng)太陽直射點(diǎn)在南回歸線時,北半球是冬至日(1222日),這一天晝最短夜最長.因此可知,秋分到冬至、冬至到春分這段時間內(nèi),北半球的晝長比夜長短;春分到夏至、夏至到秋分這段時間內(nèi),北半球的晝長比夜長長。分析選項中的節(jié)日可知,五一勞動節(jié)、六一兒童節(jié)位于春分到夏至之間,八一建軍節(jié)位于夏至到秋分之間,元旦(11日)位于冬至到春分之間,因此恩施的晝長比夜長短的是元旦;故選:D。

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