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.
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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
单项选择题
For those who do not take breakfast, the good news is that __________.
A．several studies have been done in the past few years
B．the omission of breakfast does no harm to one's health
C．adults have especially made studies in this field
D．eating little in the morning is good for health
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