单项选择题

Britain has the highest()of road traffic in the world-- over 60cars for every mile of road.

A. popularity
B. prosperity
C. intensity
D. density

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单项选择题
The energy()by the chain reaction is transformed into heat.

A. transferred
B. released
C. conveyed
D. delivered
单项选择题
We’d like to()a table for five for dinner this evening.

A. reserve
B. prosperity
C. sustain
D. retain
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