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 visible.
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单项选择题
When the speaker says that he simultaneously knew too much, and not enough , he means that he was ______.
A．more perceptive than others who were involved at this time
B．too close to the events to see them objectively
C．unable to see any significance in current events
D．confused by the number of important events that were taking place
单项选择题
According to the speaker, the problem with insider volumes is that they ______.
A．tell things that should not be told
B．lack historical perspective
C．are too sensational
D．often intentionally distort the troth
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