单项选择题

A．It is not as bad as it used to be.
B．Americans do not want to give up any more sleep.
C．Americans guarantee to change the sleeping habits.
D．Americans want to know just how bad it is to their health.
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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.
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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