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
In our country, the educational purpose is（）

A．to make children get degrees
B．to prepare children for life
C．to get everyone to live happily
D．to choose a system of education
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