一只候鸟从南方飞到北方要用一个小时,而从北方飞到南方则需二个半小时,为什么呢?
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[A] In the middle Mojave Desert near its birthplace in the US.
[B] To the south of crater Gale that is near the Martian equator.
[C] Near the Martian equator which is eroded by flowing water.
[D] On top of a 3.4-mile-high peak which used to be habitable.
求给出答案及解析,谢谢!