单项选择题

Which of the following will not result in random fluctuation

A．Unreliable equipment.
B．Cash input.
C．Management skills.
D．Earthquake.
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单项选择题
What is the passage mainly about
A．The random fluctuation.
B．The function of feedback.
C．The transformation process.
D．The investment in all forms in the production.
单项选择题
...nor does giving people breakfast improve performance meads __________.
A．anyone without breakfast does improve his performance
B．not giving people breakfast improve performance
C．having breakfast does not improve performance, either
D．people having breakfast do improve their performances, too
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