单项选择题

She worked hard at her task before she felt sure that the result would _______ her long effort.

A．justify
B．testify
C．rectify
D．verify
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单项选择题
Research has produced many new _______ that will be used in the manufacture of a variety of goods.
A．hypotheses
B．summaries
C．synthetics
D．emphases
单项选择题
The specimens to be analyzed were taken _______.
A．by accident
B．at random
C．on occasion
D．on average
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