单项选择题

The things brought down by rivers from the mountains that are useful for cultivation are ______.

A．deltas
B．crops
C．fresh water life
D．soil and minerals
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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
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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