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  3. How is the image of the north polar cap of Mars? What is the characteristic of the Martian surface according to observations ov

How is the image of the north polar cap of Mars? What is the characteristic of the Martian surface according to observations ov

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问题 How is the image of the north polar cap of Mars?
What is the characteristic of the Martian surface according to observations over the past 20 years?
选项 A、Remaining stable all the time.
B、Appearing bright red.
C、Looking dark most of the time.
D、Changing from bright to dark or vice versa.
答案D
解析 见第二段第三句Some regions that were dark 20 years ago are now bright red；some areas that were bright red are now dark.
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