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

The following sentences tell what happened many years ago. Which is the right order of the events（）

A．Archimedes took a bath
B．Archimedes discovered his principle
C．The king of Syracuse asked him to sovle a problem
D．Archimedes did the experiment on his crownA. c;a;b;dB.b;c;a;dC. b;c;d;aD. c;a;d;b

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