单项选择题

Rivers have been important to man （）

A．since the last century
B．for a very long time
C．since a few hundred years ago
D．since a few years ago

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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
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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