单项选择题

A．It tends to vary geographically.
B．It corresponds to an individual’’s social class.
C．It changes over a period of time.
D．It depends on whether or not the individual is a gourmet.
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单项选择题
A．Begin breathing through the nostrils.B．Slow down somewhat, but continue straining.C．Stop the particular exercise at once.D．Close his mouth immediately.
A．Begin breathing through the nostrils.
B．Slow down somewhat, but continue straining.
C．Stop the particular exercise at once.
D．Close his mouth immediately.
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