单项选择题

How is the image of the north polar cap of Mars

A．Vague.
B．Clear.
C．Cannot be seen.
D．Barely visibl
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单项选择题
Which of the following is TRUE about the north polar cap of Mars in summertime
A．It is at its largest size.
B．It is changing its shape all the time.
C．It is at its smallest size.
D．It is at its windiest tim
单项选择题
When were the images of Mars taken
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.
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