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    【题目】当太阳直射在北回归线上时，下列说法正确的是 （ ）

    A.南半球的澳大利亚此时已是冬季B.我国北方的河流都已经结冰

    C.南极地区出现极昼现象D.哈尔滨比广州的白昼短

    【答案】A

    【解析】

    地球围绕太阳公转时，地轴与公转轨道的平面成66.5°的固定倾角，这就使得一年内太阳光线的直射点有规律地在南北回归线之间移动。当太阳光线直射赤道时是北半球的春分日或秋分日；当太阳光线直射北回归线时是北半球的夏至日；当太阳光线直射南回归线时是北半球的冬至日。

    当太阳直射在北回归线上时，为北半球的夏至日，北半球处于夏季，南半球的澳大利亚为冬季，我国位于北半球，此时河流不会结冰，哈尔滨昼长夜短，北极地区出现极昼，南极地区出现极夜现象。哈尔滨白昼比广州长，故选：A。

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