单项选择题

What is the summertime polar cap composed of

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