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

From this selection we may conclude that the king's crown （）

A．moved less water than pure gold of the same size
B．moved more water than pure gold of the same weight
C．moved more water than pure gold of the same size
D．moved less water than pure gold of the same weight