单项选择题

The energy______by the chain reaction is transformed into heat.

A．transferred
B．released
C．conveyed
D．delivered
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单项选择题
Britain has the highest______of road traffic in the world—over 60 cars for every mile of road.
A．popularity
B．prosperity
C．intensity
D．density
单项选择题
The European Union countries were once worried that they would not have______.
A．sufficient
B．efficient
C．potential
D．proficient
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