单项选择题

The word "immersed" in the second paragraph means（）

A．lifted
B．raised
C．rose
D．under water

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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
In many modern countries, children go to school （）

A．be free education
B．to be able to marry
C．to work for society
D．to rid themselves of "low" work
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