单项选择题

The ______ of our civilization from an agricultural society to today's complex industrial world was accompanied by upheaval and, all too often, war.

A．adjustment
B．migration
C．change
D．route
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单项选择题
The child's earliest words deal with concrete objects and actions, it is much later that he is able to grapple with ______.
A．decisions
B．abstractions
C．opponents
D．mathematics
单项选择题
The pioneers' greatest asset was not their material wealth but their ______.
A．fortitude
B．simplicity
C．companions
D．possessions
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