应该是c，晨昏线是曙暮光区是一条虚拟的线，它在行星的表面画出了白天和黑夜的交界线。晨昏圈由晨线和昏线组成，晨线和昏线各是一个半圆弧，晨线的东边是昼半球，昏线的东边是夜半球。在地球，晨昏线是地球上昼半球和夜半球的分界线，是一条直径与地球接近的圆圈。
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应该是c，晨昏线是曙暮光区是一条虚拟的线，它在行星的表面画出了白天和黑夜的交界线。晨昏圈由晨线和昏线组成，晨线和昏线各是一个半圆弧，晨线的东边是昼半球，昏线的东边是夜半球。在地球，晨昏线是地球上昼半球和夜半球的分界线，是一条直径与地球接近的圆圈。
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