单项选择题

We drop a piece of metal into a jar full of water, the metal will float if it weighs less than ______.

A．an equal amount of silver
B．an equal amount of gold
C．all the water in the jar now
D．the water that leaves the jar
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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
单项选择题
The word immersed in the second paragraph means”______”.
A．lifted
B．raised
C．rose
D．under water
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