单项选择题

Most authorities believe that urban street crime _______ from a combination of poverty, poor edu- cation and a lack of opportunity:

A．rises
B．raises
C．arises
D．arouses
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单项选择题
In an automobile engine, the vaporized fuel is mixed with air, compressed in the cylinder and by a spark.
A．blazed
B．flamed
C．ignited
D．exploded
单项选择题
The remarkable _______ of life on the Galapagos Island inspired Charles Darwin to establish his theory of evolution.
A．classification
B．density
C．diversity
D．purification
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