单项选择题

Limestone that can be highly polished is _______ marble.

A．substituted by
B．known as
C．regular as
D．improved by
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单项选择题
Chaucer has been called the Father of English Poetry by _______ generations.
A．aggressive
B．progressive
C．successive
D．comprehensive
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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