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
Low work here means ______.
A．work with brains
B．work with hands
C．the work that people do at home
D．the work scientists do in the lab
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 happliy
D．to choose a system of education
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