单项选择题

A．set
B．succession
C．series
D．chain
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单项选择题
What percentage of the third class children survived
A．One-fourth.
B．One-fifth.
C．One-third.
D．a half.
单项选择题
Byrd did not agree with Ronald Amundsen in that ______.
A．the Antarctic is not a suitable place for human beings to survive
B．people cannot explore the Pole area from air
C．the airplanes would one day replace dogs and sledges
D．dogs and sledges need no human care
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