【題目】當太陽直射在北回歸線上時，下列說法正確的是 （ ）

A.南半球的澳大利亞此時已是冬季B.我國北方的河流都已經(jīng)結(jié)冰

C.南極地區(qū)出現(xiàn)極晝現(xiàn)象D.哈爾濱比廣州的白晝短

【答案】A

【解析】

地球圍繞太陽公轉(zhuǎn)時，地軸與公轉(zhuǎn)軌道的平面成66.5°的固定傾角，這就使得一年內(nèi)太陽光線的直射點有規(guī)律地在南北回歸線之間移動。當太陽光線直射赤道時是北半球的春分日或秋分日；當太陽光線直射北回歸線時是北半球的夏至日；當太陽光線直射南回歸線時是北半球的冬至日。

當太陽直射在北回歸線上時，為北半球的夏至日，北半球處于夏季，南半球的澳大利亞為冬季，我國位于北半球，此時河流不會結(jié)冰，哈爾濱晝長夜短，北極地區(qū)出現(xiàn)極晝，南極地區(qū)出現(xiàn)極夜現(xiàn)象。哈爾濱白晝比廣州長，故選：A。

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