单项选择题

The first ______ in the development of civilized man were probably the invention of primitive weapons and the discovery of fire.

A．intervals
B．breaks
C．stages
D．periods
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单项选择题
He is an artist in ______ but not in reality.
A．surface
B．title
C．rank
D．name
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She hoped that a long rest might ______ her in health.
A．improve
B．reform
C．strengthen
D．perfect
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