单项选择题

When Mr. White left the classroom, all of the students roared with _________.

A．sneer
B．smile
C．giggle
D．laughter
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单项选择题
According to the passage, which of the following is TRUE
A．The transformation process of a department store from inputs into outputs is different from that of a farm.
B．The conversion process of a department store from inputs into outputs is the same as that of a farm.
C．The transformation process can be totally free from random fluctuation.
D．Random fluctuation is important to the conversion process.
单项选择题
It can be inferred from the passage that random fluctuation __________.
A．is good to the desired transformation
B．will affect the quality of the goods produced
C．can provide information for the managers as feedback
D．does not help to provide enough information for the managers
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