如太阳直射20°N,那么                              

如太阳直射20°N,那么                                                                              

       A70°N以北为极夜区                      B.晨昏线与南北纬70°纬线相切

       C20°N纬线上各地昼长达一年中最长值     D.太阳直射点将向北移动

答案

B

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