单项选择题

A．To check the accuracy of scales.
B．To calculate the density of other metals.
C．To observe changes in the atmosphere.
D．To measure amounts of rainfall.
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单项选择题
A．People who are in the habit of switching from one bank to another.B．Young people who are fond of modern technology.C．Young people who are wealthy and well-educated.D．People who have computers at home.
A．People who are in the habit of switching from one bank to another.
B．Young people who are fond of modern technology.
C．Young people who are wealthy and well-educated.
D．People who have computers at home.
单项选择题
The traditional view of human nature was strongly challenged by ________.
A．the emergence of the evolutionary theory
B．the historical approach to man
C．new insight into human behavior
D．the philosophical analysis of slavery
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