单项选择题

A．Fifty percent higher than that of the non-students of the same age.
B．One-quarter of that of the non-students of the same age.
C．Half million.
D．Less than that in the past.
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If law and order is not preserved，_______________________________(无论是公民还是他的财产都不会安全)．
单项选择题
According to Prof Prentice, what are the reasons for the change in our shape
A．We eat too much and refuse to do physical exercises.
B．High-energy foods are easy to get and technology develops fast.
C．High-energy foods are the main diet and we use technology;
D．High-energy foods are easy to get and we consume less energy.
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