How is the image of the north polar cap of Mars? What is the summertime polar cap composed of?

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问题 How is the image of the north polar cap of Mars?
What is the summertime polar cap composed of?

选项 A、Dust.
B、Sand.
C、Water ice.
D、Volcanic rocks.

答案C

解析见第一段最后一句Previous spacecraft observations have shown that this summertime polar cap is composed of water ice，just like Earth’s polar caps．

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GCT工程硕士（英语）

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