How is the image of the north polar cap of Mars? When were the images of Mars taken?

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问题 How is the image of the north polar cap of Mars?
When were the images of Mars taken?

选项 A、In the middle of summer on Earth.
B、In the middle of summer on Mars.
C、In the middle of summer on Earth’s polar caps.
D、In the middle of summer in the northern part of Mars.

答案D

解析 见第一段第五句The images were taken in the middle of the Martian northernsummer,when the polarcap was at its smallest size.
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