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
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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
单项选择题
Her face brightened up when she saw her long-awaited friend _______.
A．turning off
B．turning away
C．turning in
D．turning up
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