单项选择题

The tone of the passage can best be described as ______.

A．biased and unprofessional
B．tentative and inconclusive
C．analytical and optimistic
D．concerned and conciliatory
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单项选择题
The material in the passage could best be used in an argument for ______.
A．increased funding for research on amorphous materials
B．further study of the history of silicon crystals
C．increased reliance on solar energy
D．training more scientists to study energy problems
单项选择题
The best title for the passage is ______.
A．The Inherent Weaknesses of the Price System
B．The Complexities of the Price System
C．Credit Terms in Transactions
D．Resource Allocation and the Public Sector
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