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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单项选择题

What is the summertime polar cap composed of

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

单项选择题

The speaker's experience in reading classified documents made him realize that ______.

A．others had been mistaken in interpreting events that they had observed
B．others knew more about current events than he did
C．he was the only responsible person who knew the truth about government affairs
D．he was a more impartial observer than anyone else in the government