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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An old friend from abroad, ______ I was expecting to stay with me, telephoned from the airport.
A．that
B．which
C．whom
D．who
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We find such shrubs ______ will best stand up to (抵御)hard weather.
A．which
B．as
C．what
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