单项选择题

Rivers have been important to man ______.

A．since the last century
B．for a very long time
C．since a few hundred years ago
D．since a few years ago
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单项选择题
The word immersed in the second paragraph means ______ .
A．lifted
B．raised
C．rose
D．under water
单项选择题
A good title for the selection is ______.
A．Archimedes
B．Archimedes’Principle
C．A gold and silver crown
D．The king of Syracuse
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