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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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