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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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
It is necessary that anyone ______ exercises every day if he wishes to keep healthy.
A．do
B．would do
C．did
D．will do
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