【題目】天安門升旗儀式的時(shí)間最早的季節(jié)是 （ ）

A. 春季B. 秋季C. 夏季D. 冬季

【答案】C

【解析】

根據(jù)地球圍繞太陽公轉(zhuǎn)時(shí)，這就使得一年內(nèi)太陽光線的直射點(diǎn)有規(guī)律地在南北回歸線之間移動(dòng)．當(dāng)太陽光直射在南回歸線上時(shí)，為北半球的冬至日，日期12月22日前后，北半球晝最短夜最長；當(dāng)太陽光直射在北回歸線上時(shí)，為北半球的夏至日，日期為6月22日前后，北半球晝最長夜最短；當(dāng)太陽光第一次直射在赤道上時(shí)，為北半球的春分日，日期為3月21日前后，此時(shí)全球晝夜平分；當(dāng)太陽第二次直射在赤道上時(shí)，為北半球的秋分日，日期為9月23日前后，此時(shí)全球晝夜平分，進(jìn)行分析解答。

地球在公轉(zhuǎn)軌道的不同位置，受太陽照射的情況也不完全相同，形成了春、夏、秋、冬四季。在中緯度地區(qū)，四季更替表現(xiàn)明顯。每年的3、4、5月為北半球的春季，6、7、8月為北半球的夏季，9、10、11月為北半球的秋季，12、1、2月為北半球的冬季；北半球的夏季，太陽高度角大，白晝時(shí)間最長，是一年中天安門升旗儀式最早的時(shí)間。故選項(xiàng)C符合題意。

故選：C。

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