单项选择题

Men who made the early maps showed that the center of the earth as _______.

A．the Sea of Darkness
B．Europe and Asia
C．swamps and deserts
D．ice mountains
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单项选择题
As is mentioned in the passage, a real danger that sailors faced was _______.
A．sea of boiling water
B．terrible monsters in the sea
C．wooden ships filled with shipworms
D．the big waves where there was a wind
单项选择题
A．soundB．whistleC．signsD．words
A．sound
B．whistle
C．signs
D．words
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