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
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 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 crown

A. c; a; b; d
B. h; c; a; d
C. b; c; d; a
D. c; a; d; b
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