单项选择题

Since you have failed three of the last four tests, you cannot afford to be ______ about passing for the term.

A．courteous
B．relevant
C．optimistic
D．passive
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单项选择题
The pioneers' greatest asset was not their material wealth but their ______.
A．fortitude
B．simplicity
C．companions
D．possessions
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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